When to Pick Cherries: Taste the Sweet Ones, Stem-Pull the Sour Ones, and Don’t Count on Ripening Off the Tree
Sweet cherries need a color-and-taste test, sour ones a stem pull, and neither ripens off the tree. See the tests, a variety timing table and rain rules.
Pick sweet cherries when they have reached full color for their variety and a taste test says they are sweet. Pick sour cherries when they are evenly colored, slightly soft, and the fruit comes off its stem with a gentle pull. Then stop waiting: cherries do not ripen after picking, so the sugar a cherry has on the day you pick it is all it will ever have.
Two popular claims don’t survive a check against extension data: that sweet and sour cherries ripen a fixed two to four weeks apart, and that all the sugar arrives in a three-day burst. Both are tested below, along with the ripeness signals that do hold up for each type.
Cherries Don’t Ripen Off the Tree, So the Branch Sets Your Sweetness
Once a cherry is off the branch, its sugar and flavor are fixed. Washington State University’s tree fruit program says ethylene plays no role in cherry maturity and that “although color may change slightly, other quality factors do not improve after harvest.” University of Illinois Extension and Penn State Extension say the same thing in plain words: pick them ripe, because they will not ripen further.
The last stretch on the tree changes a lot. A Czech study of ‘Karešova’ sweet cherry, run over four seasons, found a ripening period of 14 to 21 days in which soluble solids rose from about 12 to about 16 °Brix while firmness fell from about 2.5 to 1.5 newtons. A study of ‘Ambrunés’ sweet cherry, presented at the IV International Cherry Symposium, sampled four harvests between roughly 60 and 80 days after full bloom. Sugar climbed from 10.5 to 16 °Brix, fruit weight more than doubled (3.5 g to 8 g), flesh firmness slid from 6.5 to 4.7 newtons, and skin lightness dropped from 70 to 35, meaning the skin got much darker.
Three pre-planned garden beds, free
Stop staring at empty beds: printable plans with exact layouts, plant lists and planting calendars — yours free from the Garden Library.
Four °Brix over 14 to 21 days works out to roughly 0.2 to 0.3 °Brix per day on average. That is my own arithmetic from one cultivar’s numbers, and the real curve needn’t be a straight line. Some nursery guides say sugar jumps in the last few days, but I found no extension measurement that pins that to a specific number of days, so this article doesn’t promise a “three-day window.” What the data do show is a trade: every extra day on the tree adds color, size and sugar, and subtracts firmness. The Czech authors concluded their cultivar should be picked within one week of the start of its ripening period.
Sweet Cherries: Judge Color First, Then Taste
Color is the best single signal for sweet cherries, and a taste test is the tie-breaker. WSU calls color change the most reliable maturity indicator, notes that soluble solids rise as the fruit darkens, and says firmness tracks skin color closely. The catch is that “full color” depends on the variety. Penn State notes that cherry color runs from yellow through red to deep purple-black by cultivar, so look up what your variety looks like when finished. Iowa State Extension sets the bar for sweet cherries as the proper size, uniform color and characteristic flavor.
Size is the underrated clue. WSU reports that fruit can grow 40% in size between the earliest it might be picked and full maturity. A cherry that is colored but still looks small and tight has more to give.
A Three-Cherry Taste Test
This is a practical method, not a published protocol. It rests on one fact from WSU (heavy crop loads lower soluble solids) and a plain inference: fruit on different branches won’t all be at the same stage.
- Pick three cherries from three different branches, not three from the same cluster.
- Check that each is evenly colored and full-sized for the variety.
- Taste them. You want sweetness with the variety’s normal flavor, without a thin, sharp edge.
- If the flavor is not there, wait two days and repeat. If it improved, wait again. If it did not, pick.
Here is how the stages compare. The takeaway: an under-ripe sweet cherry is small and thin-tasting, and a past-ripe one is the sweetest but is softening, shriveling and at risk of splitting.
| Signal | Not yet | Ready | Past it |
|---|---|---|---|
| Color | Short of the variety’s full color, or uneven | Even, full color for the variety | Still darkening, but firmness is dropping with it |
| Size | Visibly smaller; still has room to grow | Full size for the variety | Full size, may begin to shrivel |
| Firmness | Hard; resists a squeeze | Firm with a slight give | Soft; risk of pitting and decay |
| Flavor | Thin or sharp | Sweet with the variety’s characteristic flavor | Sweetest, but texture is slipping |
| Stem | Green and fresh | Fresh | Browning |
| Rain risk | Cracking risk starts at first color change | Susceptible | Splits and cracks after rain |
The “past it” column comes from WSU’s list of what happens when fruit hangs too long: softening, decay, shrivel, stem browning, pitting and skin cracking after rain. Delaying harvest by a few days can darken the color, increase size and improve flavor, so the aim is to pick at the top of the curve, not before it.
Sour Cherries: The Stem-Pull Test Is One of Three Signals
Sour cherries are ready when they have the right color, feel slightly soft, and come off the stem easily. University of Illinois Extension states it as a three-part test: “A ripe cherry is ready to be picked if it has the right color, firmness, and comes off the stem easily.” Iowa State’s description of the flavor is that sour or pie cherries should be full-flavored, somewhat soft, and juicy, and that cherries picked before they are mature will not ripen off the tree.
How to Run the Stem-Pull Test
The practical version: cup the cherry, support the spur it hangs from with your other hand, and give the fruit a light upward twist. A ripe sour cherry should release with little effort. If you have to tug, give it a few more days. Supporting the spur matters because Penn State warns that fruiting spurs can last 10 to 12 years, and rough picking damages them.
One honest limit: no extension source I found publishes a pull-force number for home gardeners, so don’t use the stem pull as a stand-alone test. Pair it with color and a taste. A sour cherry will taste tart even when it is ready (Penn State calls tart cherries “perhaps too sour for fresh eating”), so what you are checking is that the sharpness has rounded into full flavor and the flesh has some give.
Stems are optional, depending on use. Iowa State says cherries can be picked without stems for immediate use, but quality is best retained in storage if they are harvested with stems attached.
Do Sweet and Sour Cherries Really Ripen 2 to 4 Weeks Apart?
Not reliably: variety and location matter more than type. Sweet cherries do bloom before sour ones, which is why Iowa State warns their flowers are more prone to late spring frost damage, but ripening dates overlap heavily. The two Utah State University Extension tables below show how much.
| Variety | Type | Harvest as listed | Table |
|---|---|---|---|
| Black Tartarian | Sweet | Mid-May | Washington County |
| Bing | Sweet | Late May | Washington County |
| Stella | Sweet | Mid-June | Washington County |
| Montmorency | Sour | Late June | Washington County |
| Bing | Sweet | Mid-June | Utah variety table |
| Montmorency | Sour | June | Utah variety table |
| Northstar | Sour | Early to mid July | Utah variety table |
| Lambert | Sweet | Mid to late July | Utah variety table |
| Meteor | Sour | Late July | Utah variety table |
| Lapins | Sweet | Late July | Utah variety table |
| Sweetheart | Sweet | Late July to August | Utah variety table |
The takeaway: in the Washington County list, Bing and Montmorency are about a month apart, but in the statewide table they fall in the same month. Sweet cherries alone span mid-June to August in the statewide table, which is a wider spread than the gap between the types. “Sweet first, sour later” is a tendency, not a calendar rule.
These are Utah calendars. University of Illinois Extension, for comparison, expects the tart cherry harvest in northern Illinois toward the middle and end of June. Use your own state’s variety table for your exact cultivars. If you haven’t chosen varieties yet, our guide to sweet, sour and Duke cherries compared by USDA zone covers pollination and hardiness, and the stone fruit by zone comparison helps if cherries are one of several candidates. Planting two cultivars with different ripening times also spreads the picking work, and a 2025 review in Frontiers in Sustainable Food Systems lists it as a way to avoid the wettest periods.
Rain and Birds Are the Only Good Reasons to Pick a Little Early
Pick a few days early only when weather or birds are about to take the decision from you. Otherwise let the fruit hang until it passes your tests, because fruit picked early cannot catch up.
Stop missing your zone's planting windows.
Select your US zone and month — get a complete checklist of what to plant, prune, feed, and protect right now.
→ View My Garden CalendarRain is the bigger risk for sweet cherries. Penn State notes they tend to crack if heavy rain falls near harvest. The Frontiers review says sweet cherries are prone to cracking from the onset of color to full maturity. The mechanism is still debated: one model blames water uptake that pushes internal pressure past a threshold, another starts with microcracks in the skin’s waxy layer, and a third points to surface wetness itself. The Czech study offers a scale of how fast fruit takes up water: after rain above 40 mm, average fruit weight rose by nearly 1 g within a few days, roughly what ten days of normal ripening add at 0.1 g per day (my comparison, based on the study’s two figures). Net covers cut the cracking index by 40% in the review’s summary, but they should go up about three weeks before harvest and can raise disease and cost.
Birds are the other deadline. Iowa State is blunt that “birds love cherries,” and says netting must cover the whole canopy and be secured at the trunk or ground, or birds get in from below. Penn State adds that tall trees end up harvested mostly by birds, while smaller trees are far easier to net.
| Situation | What to do | Why |
|---|---|---|
| Heavy rain forecast; sweet cherries fully colored and tasting sweet | Pick now | Susceptible to cracking from onset of color to maturity |
| Heavy rain forecast; fruit still pale or sharp | Don’t pick early; cover the tree if you can | Picked cherries won’t sweeten |
| Birds are taking the first ripe fruit | Net the whole canopy; pick fully colored fruit promptly | Partial netting lets birds in from below |
| Hot spell at harvest | Pick early in the day; keep fruit in shade; refrigerate soon | Heat speeds deterioration (WSU) |
| Heavy crop year | Taste before assuming the fruit is as sweet as last year’s | Heavy crop load lowers soluble solids |
Small Trees and Bush Cherries Ripen on Their Own Schedule
If your cherries are shrubs rather than trees, the same tests apply, but the picking is easier. Our guide to Nanking and Romance-series bush cherries covers how those types ripen in a staggered harvest window and why you can hand-pick them from the ground. Whatever you grow, expect several passes over a short period rather than one picking day. Penn State describes the harvest season as short for an individual tree, and the Czech cultivar’s ripening period lasted just 14 to 21 days.
Pick and Handle Cherries So They Keep
Cool the fruit fast and handle it gently. Pull softly so you don’t damage the fruiting spurs. Iowa State recommends refrigerating cherries promptly, at 32 to 35°F in perforated bags on its home-garden page (its sour-cherry answer gives 35 to 40°F), and advises minimizing wounds during harvest because brown rot spreads through damaged fruit. WSU’s commercial advice scales down to a garden: heat speeds deterioration, so harvest early in the day and keep picked fruit shaded. Penn State advises rinsing in cold water in a colander, not soaking.
Cherry Harvest FAQ
Can cherries ripen after you pick them?
No. Cherries are not like fruit that finishes ripening on a counter. WSU, Penn State, Illinois and Iowa State all say they will not ripen further once picked, and WSU adds that color may shift slightly but other quality factors do not improve.
How do you know when sour cherries are ripe?
Look for the right color, a slightly soft feel, full flavor, and fruit that comes off the stem easily. Illinois Extension uses color, firmness and easy removal from the stem; Iowa State uses “full-flavored, somewhat soft, and juicy.”
How long do cherries stay ripe on the tree?
Not long. One sweet cultivar’s ripening period lasted 14 to 21 days in a four-year Czech study, and its authors advised harvesting within a week of the period’s start. Your variety may differ, so check progress every couple of days.
Should I pick cherries with or without stems?
Leave stems on if you plan to store them, and remove them only for immediate use. Iowa State says quality is best retained in storage with the stems attached.
What if it rains right before my sweet cherries are ready?
If the fruit is already fully colored and tastes sweet, pick it before the rain. Sweet cherries are prone to cracking from first color to maturity, and heavy rain near harvest is the usual trigger. If the fruit is still pale, picking early won’t help because it will not sweeten off the tree.
Does the color tell me when my cherries are ripe?
Color is the best single sign for sweet cherries, but “ripe color” varies from yellow to deep purple-black by cultivar. Check the color your variety should reach, then confirm with a taste.
Sources
- Washington State University Tree Fruit Research & Extension. Sweet Cherry Maturity and Harvest. WSU Tree Fruit.
- University of Illinois Extension. Tart cherry season begins in Northern Illinois. University of Illinois Extension news release.
- Penn State Extension. Cherries in the Garden and the Kitchen. Penn State Extension.
- Iowa State University Extension and Outreach. Growing Cherries in the Home Garden. Yard and Garden.
- Iowa State University Extension and Outreach. When should I harvest sour cherries? Yard and Garden FAQ.
- Blažková, J., Hlužičková, I. and Blažek, J. (2002). Fruit weight, firmness and soluble solids content during ripening of ‘Karešova’ cv. sweet cherry. Horticultural Science (Prague) 29(3):92-98. doi:10.17221/4470-HORTSCI
- Tudela, J.A., Luchsinger, L., Artés-Hdez, F. and Artés, F. (2005). ‘Ambrunés’ sweet cherry quality factors change during ripening. Acta Horticulturae 667 (IV International Cherry Symposium). doi:10.17660/ActaHortic.2005.667.78
- Utah State University Extension, Washington County. Cherry. USU Extension.
- Utah State University Extension. Varieties for Utah: Cherry. Intermountain Fruit.
- Xu, J. et al. (2025). Overview of fruit cracking in sweet cherry (Prunus avium L.): causes, testing methods, mitigation strategies, and research perspectives. Frontiers in Sustainable Food Systems 9.
