How to Grow a Date Palm: Houston Has 111 Days Over 90°F and Still Isn’t Date Country — the Rain Test, and the 4 US Regions That Pass

A date palm tree survives winters down to roughly 15–20°F, but it only ripens fruit where summers are hot and nearly rain-free from pollination to harvest. Indio, California logs 184 days a year at 90°F or higher and about 0.6 inches of rain between July and October. Houston logs 111 days at 90°F or higher, which clears any 100-day heat rule, and about 18.8 inches of rain in the same four months. That is roughly 30 times the rain, and Indio is in the heart of the U.S. date industry while Houston is not.

So the question that decides whether your Phoenix dactylifera is a fruit crop or a 50-foot ornamental is not “how hot does it get?” It is “does it rain on the fruit while it ripens?” Below are the NOAA numbers for 12 cities, the four regions where backyard dates do ripen, and what to do once you are in one: pollination, offshoots, thinning, bagging, and the California quarantine that covers date palm cuttings and even the saw you cut them with.

Which US climates pass the date test?

Four regions pass: the Southern California deserts, Yuma and the lower Colorado River, the Phoenix area, and southern Nevada. All four have normal summer highs above 90°F for months and only a few inches of July–October rain at most. The table uses NOAA’s 1991–2020 climate normals for one station per city.

Heat alone does not sort these cities; rain does, and heat then separates the dry ones. Brownsville has more 90°F days than Las Vegas (141 against 137) and ten times the July–October rain. Fresno’s 90°F count matches Houston’s (113 against 111) with one-thirtieth of the rain. Any simple day-count rule, “100 days over 90°F” for example, would put Houston inside the date belt, which it is not.

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What the references document is a long season, not a day count. The FAO handbook gives growth that is active above 45°F, best near 90°F (32°C), and steady up to about 100–104°F, with a fruiting period from set to ripe of roughly 120 to 200 days. The 1945 USDA bulletin says dates need “prolonged summer heat and low relative humidity during the ripening period.” I found no extension source that turns that into a threshold, so treat the table as a screening tool, not a guarantee.

Two rows come with a caveat. Fresno and Bakersfield are dry, but they log only 36–38 days at 100°F against 111–118 at the desert stations, and I did not find an extension source documenting reliable ripening there. Tucson gets about twice Phoenix’s summer rain, which puts it in the “possible, with bagging and luck” bucket. That is my reading of the numbers, not a published ruling.

Why does rain wreck the fruit but not the tree?

Rain and humidity damage dates at specific stages of ripening, and the stage matters more than the amount. The palm itself copes with extreme heat; it is the fruit skin that cannot take water once it has reached full size. Humid air also favors Graphiola leaf spot on the fronds, according to the FAO. USDA’s date-culture bulletin and the FAO handbook describe four stages, and the damage changes at each one.

Two details change how you grow it. First, the conditions around the rain count as much as the rain. The USDA bulletin notes that a light shower with days of cloud and humidity can do more harm than a heavy downpour followed by clear, dry wind. Second, rain at flowering is its own problem: the FAO says any pollination followed or preceded by rain within 4 to 6 hours should be repeated, because water washes pollen off the flowers.

Variety is your insurance on the edge of the range. In Coachella Valley trials summarized by the FAO, Dayri, Khastawi, Thoory, Khadraoui and Sair were the least rain-damaged of 16 varieties, and Deglet Noor was among the most sensitive. Very early and very late varieties escape the rain window altogether. If you garden in a rain-prone spot within a date region, that is the first lever to pull.

Where do backyard dates actually ripen in the US?

The commercial heart is Riverside and Imperial counties in California and Yuma County in Arizona, according to Johnson and MacKnight’s series on date growing across the U.S. Home growers can reach a little further, to four regions in all.

The Southern California deserts: Coachella and Imperial valleys

This is the benchmark. Indio’s normal daily high stays above 90°F every month from May through October (93, 102, 106, 105, 101 and 91°F), and July–October rain averages about 0.6 inches. Even so, commercial growers here have long used paper covers over the bunches to guard against the occasional storm. If you are choosing palms for other parts of California, see our guide to California palm trees by microclimate.

Yuma and the lower Colorado River

Yuma County is the third leg of the industry. NOAA does not list 1991–2020 normals for the Yuma airport station, but the FAO’s long Yuma record shows about 1 to 2 millimeters of rain a month from July through October, roughly 0.2 inches for the whole season. That makes it one of the driest ripening windows in any U.S. date region.

The Phoenix area: Salt River Valley

Arizona State University calls the Salt River Valley “one of the few areas in the United States where date palms may be successfully cultivated for fruit.” Offshoots reached Tempe around 1890, and in 2001 ASU’s 450 palms yielded roughly 4,000 pounds. The catch is the monsoon: Phoenix averages 0.9 inches in each of July and August, just as early varieties are turning color. My reading is that Phoenix growers should bag at first color and favor varieties that ripen before late-summer storms. ASU’s local list includes Medjool, Khadrawy, Zahidi, Halawy, Honey and Black Sphinx, which is of Arizona origin.

Southern Nevada

The University of Nevada, Reno publishes two date palm guides for the Las Vegas area, and the numbers fit: 137 days at 90°F or higher, 78 at 100°F, 1.3 inches of July–October rain. It is the cooler edge of the range. Nevada’s harvest calendar starts with early varieties such as Khadrawy and Halaway in September and runs to December for late ones like Khisab, so on the cooler edge I would lean early; that is my inference, not a published rule.

If you garden in Texas, Florida or the Southeast

Treat a date palm as an ornamental. The 1945 USDA bulletin says that in the Gulf states from Louisiana across to Florida, “climatic conditions seldom permit fruit to ripen,” and the University of Florida notes that date palms “struggle in Florida humidity.” In Texas, only “a few of the more rain-tolerant imported varieties” showed “limited possibilities” in one inland USDA trial, and Texas A&M’s Plant Answers column warns of August and September rain that splits and sours the fruit. For palms that do fruit in humid places, start with our guide to palm trees that produce edible fruit, then see Florida palm trees by zone or palm trees in Texas.

What does the tree itself need?

A date palm wants full sun, deep drainage, 30 feet of room and a ladder. The table pulls the key numbers from the FAO, UF/IFAS, USDA and the two state extension services.

The FAO adds that the growing point sits deep inside a mat of fiber, which protects it from frost, so a frosted palm normally restarts in spring. The cost is indirect: the more leaves damaged, the poorer the fruit that year and the flowering the next. If you protect anything on a frosty night, make it the freshly pollinated flower cluster; the FAO suggests covering it with a paper bag. If winters of 15°F are normal where you live, a date palm is the wrong palm; the cold-hardy windmill palm is the better bet.

How do you hand-pollinate a date palm?

A date palm bears fruit only if it is a female pollinated by pollen from a male, and in the U.S. that job is done by hand. ASU explains why: Arizona’s winds are too weak for natural pollination, and the female flower has no scent to attract insects. Dates are dioecious, meaning separate male and female trees, which is also why the University of Florida says fruiting needs both sexes in the same area.

Seedlings come out roughly half male and half female, and you cannot tell which until the palm flowers at four to eight years old. One good male supplies pollen for up to 50 females, so a backyard needs one male at most, or pollen collected from a neighbor’s tree. Texas A&M’s Plant Answers says collected pollen keeps in a household refrigerator until the females are ready.

1. Find the sheaths in March or April. Male sheaths are broader and hold hundreds of small star-shaped flowers on strands. Female sheaths are narrower, and the flowers look like strands of pearls.
2. Collect pollen early. The USDA advises cutting male clusters early in the morning, as soon as the sheath splits, before wind and bees carry the pollen away.
3. Pollinate when the female sheath has just started to open and the small round flowers are creamy-white. The USDA method is to invert two or three male strands between the female strands in the first two to three days after opening, then tie twine around the cluster. ASU’s alternatives are dusting pollen on top or placing a pollen-dusted cotton ball inside the sheath.
4. Repeat in about two weeks. Not all female sheaths open together, and a third pass is sometimes needed. Tie a string on each pollinated cluster so you do not guess later.
5. Redo it after rain. Pollination followed or preceded by rain within 4 to 6 hours should be repeated (FAO).

Timing matters more than technique. In field trials on Barhee and Zahidi in Iran (abstract only), pollinating one to two days before the sheath cracked gave the best fruit set in Barhee, and delaying pollination up to eight days after cracking steadily cut both fruit set and yield. Earlier beats later. The USDA says a set of 50 to 80 percent of flowers is enough for a full crop, so you are aiming for decent coverage, not every flower.

Skip pollination and the palm may still set fruit, but it is poor fruit. Johnson and MacKnight describe date palms in Big Bend, Texas, whose fruit is “stunted and seedless” without a pollinator. ASU recommends removing the flower stalks in May and June on palms you did not pollinate, so inedible fruit does not drop in fall and make a mess.

Why are offshoots the only way to get the date you want?

Offshoots carry the parent palm’s sex and variety; seeds do not. The USDA says “no two seedling palms are alike” and few produce good fruit, while an offshoot always reproduces the parent type. ASU adds that seedling females “do not normally stay true to variety.” That is why a named variety such as Medjool has to be propagated from offshoots, and why a seed from a supermarket Medjool will not give you Medjools.

An offshoot is ready when it has been attached to the parent for three to five years, has its own roots and has begun growing offshoots of its own. The USDA gives 40 to 100 pounds and 8 to 14 inches across as typical commercial sizes; ASU sets a floor of at least 6 to 8 inches across the woody base. The best window is May through August. A year before cutting, mound moist soil against the base to encourage roots. Tie the fronds together before the cut to reduce water loss.

The cut itself is heavy work. Both the USDA and ASU describe a wide steel chisel driven with a mallet or sledge, with two people on the job. Keep a ball of soil two to three inches thick on the roots; cutting off the top without roots does not work. Plant slightly deeper than the offshoot grew on the mother, keep the soil moist with light, frequent watering through the first summer, and mulch against drying. If this sounds like a lot, it is; a rooted offshoot from a nursery skips the hardest step.

If you do buy or cut one, mind the California quarantine. Under 3 CCR §3419, all plants and propagation parts of the genus Phoenix, including seed, plus saws, knives and tools used on them, are barred from moving into the protected area. That area is all of Imperial County, part of Inyo County and the part of Riverside County east of Cabazon, which takes in Indio and the Coachella Valley. The target is a form of the fungus Fusarium oxysporum that causes a serious disease in Canary Island date palms. Tools can enter if certified sterilized, and special permits exist. The version I read carries a 1980 appendix date, so call the county agricultural commissioner before moving anything.

How long until a date palm bears, and what is the yearly routine?

A planted offshoot gives no fruit worth keeping for three years and a real crop in year five. The numbers below come from the USDA’s 1945 commercial figures for irrigated gardens in the Southwest; a backyard palm with less water and attention will run slower.

The month-by-month rhythm, per the ASU and Nevada guides: pollinate in March–April, thin fruit in May–June, cut offshoots May–August, bag at first color in mid to late July, and harvest September–October (late varieties run to December).

How do you thin, bag and harvest the crop?

A palm that sets too much fruit gives small fruit and then skips next year. The USDA says a palm that bears too much one year will not produce enough flowers the following season, and ASU calls this alternate bearing.

ASU’s thinning numbers are the most specific I found. At pollination, cut about one third off the center stalk. At pea size, thin the strands to 15 to 20 fruits each and about 35 strands per fruit stalk, and leave 10 to 12 stalks on a mature, healthy palm; fewer on young or weak ones. Tie the stalks down in an arch to a frond so they hang free but supported. Medjool stalks are especially brittle and need extra care.

Timing of bags matters because bags trap humidity. The USDA puts covers on when the fruit takes its khalal color; covering earlier, before color change, can increase checking and blacknose because it cuts ventilation. ASU recommends porous material such as lightweight burlap or cheesecloth, or waxed paper with an open lower end, and warns that unsuitable bags cause heat build-up and spoilage.

Harvest by cutting the whole bunch when three quarters of it has reached rutab. Medjool and a few others do better in two or three “thinning” pickings one to two weeks apart, shaking the bag over a tub. Wash with water only and air-dry. ASU says dates dry best at 90°F; soft types such as Black Sphinx and Barhee should be refrigerated, and frozen if kept 2–3 months or more.

What is wrong with my date palm?

Most date problems are rain, pollination or crop-load problems, not diseases. This table sorts the symptoms.

Date palm questions, answered

Can you grow a date palm in Florida, Texas or Georgia?

Mostly no, if you want ripe fruit. The 1945 USDA bulletin says climate seldom permits fruit to ripen in the Gulf states east of Texas, Texas A&M warns of late-summer rain splitting the fruit, and UF/IFAS says date palms struggle in Florida humidity. Use it as an ornamental, or pick one of the palms that produce edible fruit in humid climates.

How long does it take for a date palm to produce dates?

About five years from a rooted offshoot for a first real crop, and 10 to 15 years to peak yield, per USDA figures for irrigated Southwest gardens. From seed, Texas A&M’s Plant Answers says up to about 20 years.

Do I need both a male and a female date palm?

You need at least pollen from a male. Only females bear fruit, they are pollinated by hand, and one male supplies pollen for up to 50 females.

Can I grow a date palm from a grocery-store date seed?

You can, but about half of the seedlings will be male, you cannot tell which until four to eight years, and females seldom match the fruit you ate. Offshoots are the way to get a known variety.

How cold can a date palm take?

Leaf edges start to yellow near 21°F, and Nevada Extension says the palm survives the mid to lower teens only briefly. Mississippi State rates it hardy to zone 8b.

1. Nixon, R.W. Date Culture in the United States. USDA Circular 728, 1945 (archived; historical document). Internet Archive
2. Zaid, A. and de Wet, P.F. Chapter IV: Climatic requirements of date palm. In Date Palm Cultivation, FAO Plant Production and Protection Paper 156 Rev. 1, 2002
3. NOAA National Centers for Environmental Information. U.S. Climate Normals, 1991–2020 (annual/seasonal and monthly normals)
4. Arizona State University Arboretum. ASU Date Palm Stewardship (month-by-month date gardening guide)
5. Robinson, M.L. Date Palm Gardening Guide for Southern Nevada. University of Nevada, Reno Extension, FS-02-99, 2002
6. Robinson, M.L., Brown, B. and Williams, C.F. The Date Palm in Southern Nevada. University of Nevada, Reno Extension, SP-02-12, 2002
7. California Department of Food and Agriculture. Plant Quarantine Manual, 3419 Date Palm Disease (State Interior Quarantine)
8. University of Florida IFAS Extension. Phoenix dactylifera, Date Palm (FPS/FOR252, FR314)
9. University of Florida IFAS Extension. Date Palm. UF/IFAS Gardening Solutions, Palms and Cycads
10. Johnson, D.V. and MacKnight, J.C. Date Palm (Phoenix dactylifera) and Other Exotic Orchard Fruit Crops in Big Bend, Texas. PalmArbor 2023-08:1–15
11. Marashi, S.S. Determination of the best pollination time of Barhee and Zahidi date cultivars. Date Palm and Tropical Fruit Research Institute, 2011 (FAO AGRIS record)
12. Mississippi State University Extension. Cold Injury to Palms (P2828)
13. Texas A&M AgriLife, Plant Answers. Date Palms in Texas