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Fruits, Nuts & Perennial Crop CalendarsCherry Calendar: Sweet vs. Sour
Sweet and sour cherries look similar in the catalog but behave differently in the yard. This guide separates them so you can plan the year correctly.
Key points
- Sour cherries are hardier and often self fruitful; sweet cherries are more demanding.
- Early bloom needs a site that drains cold air.
- Rain near harvest can crack sweet cherries.
- Taste before picking, and net against birds.
How do sweet and sour cherries differ?
Sour, or tart, cherries are generally hardier and more self fruitful, so one tree can bear a crop. Sweet cherries usually need a second compatible variety and are more sensitive to cold, to rain near harvest and to disease. Many home growers in colder regions do better with sour types.
Extension guides from Iowa, Virginia and Penn State all separate the two groups, so check one near you before ordering trees.
When do cherries bloom and what is the frost risk?
Cherries bloom early in spring, and open flowers are easily damaged by freezing temperatures. Sweet cherries tend to flower a little earlier than sour ones. A warm early spring that brings bloom forward raises the risk.
Use the same strategy as other early fruit: plant on ground that drains cold air, and keep an eye on forecasts during bloom. Do not rely on a plant hardiness zone to predict frost; zones describe winter minimums only.
- Plant on ground where cold air drains away
- Check the forecast every night during bloom
- Record bloom dates each year
What is the best cherry pruning schedule?
Sour cherries are usually pruned lightly in the dormant season to keep an open shape. Sweet cherries are vigorous and can be pruned in late summer in some areas to reduce the chance of disease entering fresh cuts. Practices vary by region, so check with extension.
Always start with dead, damaged and crossing wood. Avoid heavy topping cuts, which can invite problems and cause weak regrowth.
Keep tools clean between cuts, especially if you have removed diseased wood, and dispose of the prunings rather than leaving them under the tree.
How does rain affect cherry harvest?
Rain close to ripening can cause sweet cherries to crack, and wet weather encourages brown rot. This is one reason sweet cherries are a harder crop in humid regions. Sour cherries are less prone but not immune.
If you grow in a wet region, ask extension about varieties with better crack tolerance and about site choices that dry quickly after rain.
- Ask extension about crack-tolerant varieties
- Pick a site that dries quickly after rain
- Remove rotten fruit so it does not spread
How do you tell when cherries are ripe?
Color alone is not enough. Ripe fruit reaches full, deep color for the variety, and the real test is taste. Sweet cherries do not continue to ripen after picking, so leave them until they are ready. Sour cherries for baking are often left slightly longer to develop sugar.
For example, if birds begin working the tree, that is a warning that fruit is close, but test a few cherries before you pick the whole crop. Netting is the most common protection against birds.
What goes on the cherry calendar through the year?
Winter is for dormant pruning and equipment. Early spring is for bloom watching and frost response. Late spring is for monitoring fruit set and disease. Early summer is for netting, harvest and cleanup. Late summer is for any pruning your area recommends and for watering during dry spells.
Spray timing for cherries is regional and regulated. Use your state extension spray guide, follow the label, observe pre-harvest intervals and protect pollinators.
Check with extension on whether late summer pruning of sweet cherries makes sense in your region, since rainy climates and dry climates give different advice.
What mistakes do cherry growers make, and how big a tree should you plan for?
Planting a single sweet cherry and expecting fruit is the most common error. Many sweet varieties cannot pollinate themselves, and some pairs are not compatible with each other. Always check the pollination chart your nursery or extension office provides before you buy.
Another mistake is choosing a sweet cherry in a region with wet springs and humid summers, then losing fruit to cracking and rot year after year. If your area is humid, sour cherries are often the more dependable choice. A third mistake is skipping bird protection until fruit is nearly ripe. Net the tree before color develops, because birds find fruit fast and can take a crop in a few days.
Cherry trees on standard rootstock grow large, which makes pruning, netting and picking difficult. Dwarfing and semi-dwarfing rootstocks keep the tree within reach of a ladder. Ask your nursery which rootstocks suit your soil and climate, and what spacing they recommend.
- Check compatibility before buying sweet cherries
- Match type to your rainfall and humidity
- Net before the fruit colors
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.