Oklahoma Planting Guide: What to Grow and When

Oklahoma makes gardening harder than it has to be. The Panhandle sits in a semi-arid short-grass prairie where frost can arrive in October and last frost dates push well into late April or May. Southeastern Oklahoma, less than 500 miles away, gets 50 inches of rain per year, a growing season of 250 days, and enough winter mildness that gardeners there treat fall as a second spring. And in central Oklahoma — in the Oklahoma City corridor where most of the state’s population gardens — summers routinely hit 100°F while spring arrives early enough to put out tomatoes before most of the country has finished pruning roses.

This guide divides the state into three regions — Panhandle and Northwest, Central Oklahoma, and Southeast — and gives each region its own frost dates, timing windows, and crop recommendations. The variety picks and calendar dates draw from Oklahoma State University Cooperative Extension research conducted in Oklahoma conditions, not generic zone averages. If you’ve gardened somewhere else and moved to Oklahoma, expect to relearn some timing. If you grew up here, this is a reference to stop second-guessing yourself.

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Oklahoma’s Growing Zones: Four Zones, Two Climates

Oklahoma spans four USDA Plant Hardiness Zones, from 6a in the far western Panhandle to 7b in the southeastern corner. Zone 6a covers Cimarron County around Boise City, where winter lows can drop to -10°F and the growing season is the shortest in the state at roughly 160 days. The rest of the Panhandle and most of northwestern Oklahoma (Woodward, Liberal area) falls in Zone 6b, where lows reach 0 to -5°F. Central Oklahoma from Oklahoma City through Tulsa, Stillwater, and Lawton sits mostly in Zone 7a, with average winter lows of 0 to 10°F. Southeastern Oklahoma — the Ouachita Mountain foothills around McAlester, Poteau, and Durant — reaches Zone 7b, where winter lows rarely drop below 5°F and the growing season approaches 250 days.

The zone classification tells you about cold tolerance, but it doesn’t capture the practical difference between gardening in Woodward and gardening in Durant. Those two cities are both in Oklahoma, both labeled Zone 6b or 7a, and yet they receive dramatically different summer rainfall (under 20 inches west, over 50 inches east), face different soil profiles, and have completely different disease and pest pressure. Use zone as a starting point for perennial selection, then treat the regional calendar below as your actual guide to planting timing. The 2023 USDA zone update shifted some areas of central Oklahoma from 6b to 7a — if you’re working from an older map, verify your current designation before selecting borderline-hardy perennials. Our guide on climate zone migration explains what those map shifts mean for long-term garden decisions.

Oklahoma Frost Dates by City

These dates represent 50% probability of frost occurrence, drawn from OSU Cooperative Extension records. A 50% probability means half of years will see frost before or after this date — use the later dates below when protecting sensitive transplants like basil, tomatoes, or peppers.

Dates reflect 50% frost probability from OSU Cooperative Extension historical records. For transplant protection, use the 10% probability dates, which run approximately 2 weeks later for spring and 2 weeks earlier for fall.

Oklahoma Planting Calendar at a Glance

The table below divides Oklahoma into three practical planting regions. The Panhandle and Northwest covers Boise City, Guymon, and Woodward. Central Oklahoma covers Oklahoma City, Tulsa, Stillwater, Enid, and Lawton. Southeast Oklahoma covers McAlester, Ardmore, Durant, and Poteau. All dates assume outdoor direct sowing or transplanting without frost protection.

Spring Planting in Oklahoma: March Through May

Spring in Oklahoma moves fast. A mild March in Oklahoma City will tempt gardeners to plant tomatoes weeks before it’s safe — and then a late cold snap sweeps through, as they tend to do, and kills everything back to the crown. The best rule is to wait until daytime soil temperatures at 4 inches deep read 60°F consistently before transplanting warm-season crops. A cheap soil thermometer is more reliable than the calendar, especially in years where spring is two weeks ahead of schedule one week and two weeks behind the next.

Central Oklahoma (March): Early March is safe for cool-season crops — direct-sow spinach, lettuce, arugula, and radishes once the soil can be worked. Transplant broccoli, cabbage, and cauliflower after mid-March if a sustained warm spell opens things up, but keep row cover on hand for nights below 28°F. Oklahoma’s reputation for late-season cold snaps is earned.

Central Oklahoma (April): This is the main tomato and pepper window. After April 1 (and after your last local frost date), transplant warm-season starts. Set tomatoes deep — burying two-thirds of the stem prompts root development along the buried portion. Okra, cucumbers, and summer squash go in from April 15 onward. Wind is a serious issue in spring — stake everything at planting, not after you watch a young pepper plant snap off at the base during an April storm.

Panhandle and Northwest Oklahoma (May): The Panhandle follows a compressed spring schedule. Frost risk persists into late April in the Panhandle — Boise City’s average last frost runs April 28, and the 10% probability date pushes past May 10. Don’t rush. Wait until daytime temperatures are reliably above 70°F and nights stay above 45°F before transplanting any warm-season crops. The upside: once the window opens, the semi-arid Panhandle has excellent growing conditions — dry air reduces fungal pressure, and cool nights improve tomato fruit set before summer heat builds.

Spring is also the right time to think about companion planting. Tall crops like corn planted on the north side of a lettuce row extend productive life by a week or two as temperatures climb in May. Marigolds throughout vegetable beds suppress soil nematodes, which run high in Oklahoma’s sandy loam soils. Our companion planting guide breaks down which pairings actually improve yields versus which ones are garden folklore.

Oklahoma Summers: June Through August

June through August in central and western Oklahoma is brutal by any reasonable measure. Oklahoma City averages 63 days above 90°F annually. Lawton sees temperatures over 100°F most summers. Hot, dry wind — a regular feature from June through August in the western half of the state — accelerates moisture loss and can physically damage plants that would otherwise handle high heat fine. Eastern Oklahoma runs humid alongside hot, which substitutes fungal disease pressure for the wind and drought stress of the west.

Standard tomato and snap bean varieties drop blossoms when nighttime temperatures stay above 70°F, which happens regularly across Oklahoma from mid-June through August. The plants don’t die — they just stop setting fruit. Knowing this changes how you plan the season.

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Heat-Set Tomatoes: Oklahoma’s Summer Solution

Heat-set tomato varieties were bred specifically to continue pollinating and setting fruit at high night temperatures. OSU Extension recommends Celebrity, Heatmaster, and BHN-968 as the most reliable heat-set choices for Oklahoma conditions. Heatmaster, in particular, has proven itself across multiple Oklahoma trial sites — it continues setting fruit even when nights stay above 75°F, which standard varieties can’t do. Plant heat-set transplants in early to mid-June for a late-summer and fall harvest that begins in August and runs through October.

Keep heat-set tomatoes consistently watered — they need more irrigation than spring-planted tomatoes because evapotranspiration rates are highest in July and August. A thick mulch layer (3–4 inches of wood chips or straw) makes a visible difference in moisture retention and soil temperature management during the worst summer weeks.

The Oklahoma Summer Survival Crop List

Okra belongs in every Oklahoma summer garden. It’s the one vegetable that actively performs better as temperatures rise — production typically peaks in July and August, exactly when everything else is struggling. Clemson Spineless is the standard variety, widely available and reliable. Cajun Delight produces earlier, which matters if you’re in the Panhandle working with a shorter season. Direct-sow into warm soil (65°F minimum) and plan for 5–6-foot plants by midsummer.

Southern peas (cowpeas, field peas, black-eyed peas) are equally heat-tolerant and add a benefit okra can’t: they fix atmospheric nitrogen into the soil, enriching the bed for whatever follows them in fall. Plant from May through mid-July across central and southern Oklahoma. Zipper Cream and Purple Hull are the most popular varieties in the state, both widely adapted to Oklahoma soils and heat.

Sweet potatoes planted in late April or May reach harvest maturity in August and September. Beauregard, developed at Louisiana State University but widely trialed in Oklahoma, is the standard commercial and home garden choice. Plant slips rather than seed — slips (rooted vine cuttings) establish quickly and produce uniform tubers. Eggplant, particularly Japanese and Chinese varieties with thinner skin and smaller fruit, handles Oklahoma heat better than the large Italian types and keeps producing through September in most areas.

Use July and August for fall-crop preparation. Start broccoli, cauliflower, and cabbage seeds indoors in late July (central Oklahoma) or early August (Panhandle) so transplants are 4–6 weeks old when outdoor temperatures moderate in September. A second planting of heat-set tomatoes and peppers in mid-July extends the season well into October.

Fall Planting in Oklahoma: September Through November

Oklahoma’s fall garden is underused by a lot of gardeners who mentally mark the season as finished when summer crops start declining. That’s a mistake. From September through November, Oklahoma’s moderate temperatures, improving rainfall patterns, and reduced insect pressure make fall an excellent time for cool-season production — often better than the equivalent spring window, because crops mature into cooling rather than warming temperatures.

September: The pivot month. In central Oklahoma, set out broccoli, cauliflower, cabbage, and Brussels sprouts transplants in early to mid-September — aim for plants established before October 1 so they size up before nights drop below 40°F. Direct-sow spinach, lettuce, and arugula from September 1 through early October. In southeast Oklahoma, hold transplants until mid-September when soil temperatures drop below 85°F, which prevents transplant shock. The Panhandle and northwest start fall planting in August — broccoli transplants need to go in by mid-August to mature before frost arrives in October.

October: Full cool-season momentum statewide. Direct-sow beets, carrots, and turnips for late-season harvest. Plant garlic cloves 2 inches deep and 6 inches apart — they’ll develop roots before winter, then resume growth in early spring for a May or June harvest. Fall pansies and snapdragon transplants go in during October; both survive Oklahoma winters in central and southern zones with minimal protection. Dig sweet potatoes before the first fall frost (sweet potato vines blacken quickly after a freeze, which can accelerate tuber decay).

November: In central and southeast Oklahoma, continue planting cold-hardy greens through early November — kale, Swiss chard, collards, and spinach handle frosts to 20°F with no protection and often produce sweeter leaves after light freezes. Plant fruit trees and blueberry bushes in November: fall planting gives root systems 4–5 months to establish before spring growth demands peak energy. In the Panhandle, the season wraps up in October; focus on soil amendment and cover crops (winter wheat, Austrian winter peas) to protect and improve beds.

Fall is also when the year-round garden plan pays off. Staggering successive plantings from August through October means you’re harvesting something almost every week through December in central and southeast Oklahoma. For a systematic approach to keeping production continuous across seasons, our year-round planting guide covers succession strategies built around Oklahoma’s dual-season structure.

Winter Gardening in Oklahoma: December Through February

December and January mean different things depending on where in Oklahoma you garden. In Durant and the southeastern corner, cool-season greens grow through most of the winter — growth slows in the shortest days, but kale, spinach, and chard remain harvestable through January in most years. An occasional hard freeze (below 20°F) requires row cover protection, but these events are short-lived in Zone 7b. In Oklahoma City and Tulsa, January is the coldest month and brings temperatures that kill unprotected cool-season transplants. Established plants under row cover typically survive, but December soil temperatures are cold enough to stop germination of newly direct-sown seeds.

In the Panhandle, winter means genuine cold. Temperatures below 0°F are possible in Zone 6a, and perennial beds need protection — mound tender perennials with 4–6 inches of dry mulch after the ground freezes. Use January for seed catalog planning, soil testing, and amendment — lime or sulfur applications made in late winter have months to adjust pH before planting begins.

Pruning season runs from December through February statewide. Dormant-prune fruit trees before late January to avoid stimulating growth before frost risk ends. Pecan trees take their dormant pruning in February. February is also the month to start tomato and pepper seeds indoors — central Oklahoma gardeners transplanting in April need seeds started 6–8 weeks before their last frost date.

Top Vegetables for Oklahoma Gardens

The table below draws from OSU Cooperative Extension research and Extension fact sheet HLA-6009, which lists variety performance across Oklahoma trial sites from Panhandle conditions to southeast Oklahoma humidity.

Flowers for Oklahoma Gardens

Oklahoma’s heat eliminates a lot of standard annuals that work fine in zone 6 but collapse in July and August. The following plants have proven themselves in Oklahoma conditions — most appear in Oklahoma State University Extension landscape trials or are recommended in OSU fact sheets for Great Plains gardening.

Fruit Trees and Berries for Oklahoma

Pecans are the state tree of Oklahoma and the most widely grown backyard fruit tree in the state. Established pecan trees produce 50–150 pounds of nuts per year and live for generations. Choosing the right variety matters — the Wichita variety produces well in western Oklahoma’s drier conditions and is widely available. Pawnee and Cheyenne are better choices for eastern Oklahoma, where higher rainfall can favor different disease resistance profiles. Native Oklahoma blackjack pecans grow wild across much of the state and are smaller-nutted but extremely drought-tolerant. Pecans need at least two varieties for good pollination, and they’re large trees — plan for 40–60 feet of spread at maturity.

Peaches are the most widely grown commercial orchard fruit in Oklahoma and perform well as home garden trees in Zones 6b through 7b. Oklahoma summers provide the heat units peaches need to develop full flavor. The key is selecting varieties with enough chill hours to break dormancy reliably but not so many that late frosts take out the bloom. Redhaven (950–1,000 chill hours) works well in northeast Oklahoma; Harvester and Loring (750–950 hours) suit central Oklahoma; Flordaprince and other low-chill types (250–400 hours) are needed in the warmest southeast areas. Plant in well-drained, full-sun locations — peaches are extremely sensitive to wet feet and will die back quickly in heavy clay without amendment or raised planting mounds.

Blueberries grow well across eastern Oklahoma but require pH adjustment to 4.5–5.2. Most Oklahoma soils run pH 5.5–7.0, making soil acidification necessary before planting. Work sulfur and peat moss into the soil 6–12 months before planting to allow the pH to adjust. Premier, Climax, and Brightwell are OSU-recommended varieties suited to Oklahoma heat. Plant at least two varieties for cross-pollination; November is the best planting month for establishment.

Figs grow reliably in Zone 7a and warmer — which covers most of Oklahoma outside the Panhandle. Celeste and Brown Turkey are the standard choices, both cold-hardy to about 10°F when established. In Zones 6a–6b (the Panhandle), fig stems die back in most winters but roots often survive and resprout; treat as a die-back perennial and plant in a south-facing microclimate for best results. Chicago Hardy is the best choice for cold sites. Pears (Kieffer, Orient) and plums (Bruce, Methley) grow statewide with fewer pest problems than peaches and are worth considering for lower-maintenance home orchards.

Oklahoma Soil and Companion Planting

Oklahoma soils range from the heavy red clay prevalent in central Oklahoma to sandy loam in the southeast to the lighter, alkaline soils of the Panhandle. The red clay of the OKC region is notoriously difficult — it compacts severely, drains poorly, and bakes to a concrete-like hardness in July heat. Raised beds filled with a 50/50 blend of compost and native soil are the most practical solution for central Oklahoma gardeners. Building permanent raised beds with 10–12 inches of amended soil depth delivers dramatically better results than trying to amend clay in-ground year after year.

Oklahoma soil pH varies significantly by region. Panhandle soils often run alkaline (pH 7.0–8.0), which locks out micronutrients and makes iron deficiency common in vegetables. Eastern Oklahoma soils tend toward acidity (pH 5.5–6.5), which suits blueberries but needs lime for brassicas and beans. A soil test through your local OSU Extension office costs a few dollars and eliminates years of guesswork about amendments. Oklahoma also has pockets of soil high in soluble salts from historical land use — extension soil testing catches this and recommends remediation before you plant into an invisible problem.

Wind is the gardening variable specific to Oklahoma that most general planting guides don’t address. Spring and early summer windstorms — sometimes straight-line, sometimes from severe weather — can physically damage plants, snap off transplants, and desiccate foliage overnight. Stake everything from the moment it goes into the ground: peppers, tomatoes, tall annuals, and young trees. Windbreak plantings along the northwest edge of a garden (the direction most severe storms approach from) make a measurable difference in plant protection and moisture retention through evapotranspiration reduction.

Companion planting delivers particular value in Oklahoma’s extended season. French marigolds planted throughout vegetable beds reduce nematode populations in sandy soils — nematode pressure runs high in eastern Oklahoma’s lighter soils. Basil planted near tomatoes shows reduced aphid pressure in field conditions. Sweet corn planted on the north side of lettuce provides enough shade to extend lettuce harvest by two weeks in May as temperatures climb. See our full companion planting guide for spacing and combination details built around what actually works in Great Plains conditions.

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Frequently Asked Questions

When is the last frost in Oklahoma?

Last frost dates vary considerably across Oklahoma. Oklahoma City averages a last spring frost around March 28. Tulsa averages around April 3. Lawton runs earlier, around March 23. The Panhandle is later — Woodward averages April 12 and Boise City runs as late as April 28. Southeast Oklahoma around Durant sees its last frost as early as March 12. These are 50% probability dates — plan on waiting 2 additional weeks for frost-sensitive transplants like tomatoes, basil, and peppers when spring is running cooler than normal.

What can I plant now in Oklahoma?

Depends on where you are and the current month. Oklahoma operates on a two-season model with spring cool-season crops (February–April), warm-season crops (April–September), fall cool-season crops (August–November), and a short summer window specifically for heat-tolerant crops like okra, southern peas, and heat-set tomatoes. Check the regional calendar above for your specific location — central Oklahoma and southeast Oklahoma gardeners have opportunities across most of the year, while Panhandle gardeners work a compressed May–October window.

Can you grow tomatoes in Oklahoma’s heat?

Yes, but summer tomato production requires heat-set varieties. Standard tomatoes drop blossoms when nighttime temperatures stay above 70°F, which happens regularly across Oklahoma from June through August. Heat-set varieties — Heatmaster, BHN-968, Solar Fire, and Celebrity — continue setting fruit through Oklahoma’s hot nights. Plant a second round of heat-set transplants in mid-June for harvest that begins in late August and runs through October. Keep them consistently watered and mulched heavily.

What vegetables grow best in Oklahoma summers?

Okra is Oklahoma’s best summer vegetable — it produces most heavily when temperatures exceed 90°F, making July and August its peak season. Southern peas (cowpeas, black-eyed peas, field peas) are the other essential summer crop, tolerating heat that kills snap beans entirely. Sweet potatoes, eggplant (especially Japanese varieties), watermelons, and heat-set tomatoes round out the practical summer garden. Avoid planting standard tomatoes, snap beans, broccoli, lettuce, or spinach for summer harvest — they’ll survive but won’t produce until temperatures drop.

What fruit trees do best in Oklahoma?

Pecans are the state tree for a reason — they’re adapted to Oklahoma conditions across most of the state and produce heavily with minimal inputs once established. Peaches do well in most of Oklahoma; choose varieties with 750–950 chill hours for central Oklahoma and lower-chill types for the warmest southeastern areas. Figs are reliable in Zone 7a and warmer (Chicago Hardy survives into Zone 6b with protection). Plums (Bruce, Methley) grow statewide and have fewer pest problems than peaches. Avoid high-chill apple varieties — most of Oklahoma doesn’t accumulate enough chill hours for reliable annual production.

Sources

1. Oklahoma State University Cooperative Extension. Oklahoma Vegetable Gardening Guide (HLA-6009). OSU Extension.
2. Oklahoma State University Cooperative Extension. Fruits for Oklahoma Home Gardens (HLA-6235). OSU Extension.
3. Oklahoma State University Cooperative Extension. Pecan Varieties for Oklahoma (HLA-6201). OSU Extension.