Cucumber planting dates by zone

Choosing a cucumber

Clemson’s Home & Garden Information Center divides cucumbers into two groups: slicers, long and slender with smooth skin, usually eaten raw, and picklers, shorter and blockier with bumpy skin, which may also be eaten raw. UF/IFAS Gardening Solutions names ‘Sweet Success’, ‘Poinsett’, ‘Ashley’, ‘MarketMore 76’, ‘Straight Eight’ and ‘Space Master’ as slicers for Florida.

Most cucumbers need bees. University of Minnesota Extension says the plants carry separate male and female flowers and an insect must carry the pollen between them. Clemson says that if misshapen fruit from poor pollination is a problem, parthenocarpic cultivars such as ‘Diva’, ‘Excelsior’ and ‘Sugar Crunch’ set long, seedless fruit without pollinating insects. University of Illinois Extension says all-female (gynoecious) hybrids may be earlier and higher yielding, and the seed company usually mixes in some seed of a standard variety as a pollinator.

For a small garden, Clemson says bush varieties produce well in a limited space and are a good choice where a trellis is not possible. Where downy mildew is usually a problem, UF/IFAS names resistant varieties such as ‘Cortez’, ‘Daytona’ and ‘Dominator’; Illinois says resistant varieties are the answer to cucumber mosaic virus and powdery mildew as well.

Sowing and setting out

Minnesota calls direct seeding the best way to start cucumbers, after the last frost date once the soil has warmed, which in most of Minnesota is late May. Illinois also plants after the danger of frost has passed and the soil has warmed. The table above dates outdoor sowing 2 weeks after each zone’s median last spring freeze, the offset our seed-starting tool uses.

For an earlier crop you can start plants indoors. Minnesota starts seeds no earlier than four weeks before the last frost date, in peat pots set straight into the soil, taking care not to damage the taproot; Illinois sows two or three seeds per pot 3 to 4 weeks before the frost-free date and thins to one, and Clemson starts seeds two to three weeks before planting out. Illinois says cucumbers do not transplant as bare-root plants, and UF/IFAS, because cucumbers are so sensitive to root damage, does not advise transplanting at all in Florida. The table’s indoor date is 3 weeks before the median last freeze and its set-out date 1 week after.

Sow seed one-half inch deep, Minnesota says; Illinois says one-half to one inch. Both Minnesota and Illinois say black plastic mulch warms the soil for earlier planting and earlier yields, and Minnesota cuts holes in it and sows through them.

Trellis or ground

On the ground, Minnesota sows vining types two inches apart with two or three feet of room on each side of the row, or in hills of three or four seeds five to six feet apart, then thins to 8 to 12 inches apart. Clemson spaces untrellised plants 8 to 10 inches apart in rows 5 feet apart; Illinois thins to one plant every 12 inches, or three plants every 36 inches in hills.

On a trellis, Clemson sows four to five seeds per foot in rows 3 feet apart and thins to 9 to 12 inches. Its trellis is about 6 feet high with top and bottom wires and twine tied between them at each plant, posts no more than 15 feet apart. Minnesota uses a three- to four-foot trellis and says it gives perfectly straight fruit and lets rows sit closer together. Illinois warns that wind whipping the plants can make vertical training impractical, and says wire cages also work.

Minnesota covers emerged seedlings with spun row cover against cold nights, but says the cover keeps out pollinators too, so it must come off once flowering begins unless the variety is seedless.

Water and feeding

Minnesota gives cucumbers about one inch of water a week from rain or irrigation, soaking the soil and keeping the leaves dry with a drip or soaker hose; trellised plants may need water more often. Clemson waters to at least 6 inches deep at the base of the plant in the morning and says an even supply matters most during fruit set. Illinois says moisture is especially critical as fruit begins setting.

Clemson says too much nitrogen gives excess vine growth and less fruit, and side-dresses before the vines start to run; Illinois side-dresses when the plants begin to vine. UF/IFAS says too much nitrogen hurts flowering and fruiting, and suggests a soil test. Minnesota and Clemson both aim for a soil pH of 6.0 to 6.5.

Minnesota waits to spread straw or compost mulch until the soil is fully warm, because these mulches slow soil warming; Clemson uses pine straw or bark in summer to keep untrellised fruit clean.

Southern timing

Clemson’s planting table gives the South Carolina Piedmont April 15 to June 5 in spring and August 1 to September 30 in fall, and the Coastal Plain March 15 to May 15 and August 1 to 30.

UF/IFAS gives North Florida February to April and again August and September, Central Florida January to March and again September, and South Florida September to February. Texas A&M AgriLife’s home vegetable gardening guide sows cucumbers 1 to 6 weeks after the frost-free date in spring and 10 to 12 weeks before the first freeze in fall.

For a fall crop anywhere, Illinois plants in mid- to late summer. The table’s last sowing counts back 60 days from each zone’s median first fall freeze, our crop table’s days to harvest with no frost to spare, since Clemson says cucumbers are killed by light frosts.

Harvest

Clemson says cucumbers are ready in about 50 to 70 days, depending on the cultivar, and UF/IFAS gives 40 to 65 days from planting. Pick before the seeds harden or the skin yellows: Illinois picks at 2 inches for small cucumbers, 4 to 6 inches for dill-size and 6 to 8 inches for slicers; Clemson picks picklers at 2 to 6 inches and slicers and burpless types at 6 to 10.

Keep picking. Illinois says the fruit grows rapidly and should be picked at least every other day, and that a single over-mature cucumber left on the vine can stop the vine producing. Minnesota says large fruit left on the vine lowers the yield. Clemson cuts the stem with a sharp knife or pruners, and Minnesota does not pick when the vines are wet, which spreads disease.

Common problems

Cucumber beetles are the first pest. Illinois says they attack seedlings as they emerge and carry bacterial wilt, which makes plants wilt and die, usually about when the first fruit is half grown, by which time it is too late; control the beetles from the day the seedlings come up. Minnesota says bitter varieties attract more beetles, so non-bitter varieties bring fewer pests.

Flowers that drop without fruit are usually males. Minnesota and Illinois say the first flowers are male and fall off normally; Clemson says the first 10 to 20 flowers are male, and that hand pollination in the morning, rubbing pollen from a male flower onto a female’s stigma, can help where bees are scarce. Illinois and Clemson say misshapen fruit comes from poor pollination or low fertility.

Clemson says bitterness comes partly from wide swings in temperature and partly from the variety, and is strongest at the stem end. It lists powdery and downy mildew among the diseases worst from midsummer to fall, and says watering at the base rather than overhead lowers the humidity that drives them. UF/IFAS adds pickleworm, melonworm and melon thrips in Florida.

Common mistakes

• Sowing into cold soil. Minnesota and Clemson say the seed will not germinate and plants set into cold soil grow poorly.
• Letting cucumbers grow large on the vine. Illinois says a single over-mature fruit can stop the vine producing.
• Leaving row cover on through flowering. Minnesota says it keeps the bees out.
• Too much nitrogen. Clemson says it gives vines instead of fruit.
• Overhead watering. Clemson says it raises the humidity that brings on mildew.
• Ignoring cucumber beetles on seedlings. Illinois says they spread bacterial wilt long before the plants show it.

We found no cucumber source for Louisiana, Alabama or Mississippi that we read for this page. The Southern timing here is Clemson’s, UF/IFAS’s and Texas A&M AgriLife’s.

Questions

When should I plant cucumber seeds outside?

University of Minnesota Extension sows cucumbers after the last frost date once the soil has warmed, which is late May in most of Minnesota. The table on this page gives a date 2 weeks after each zone’s median last spring freeze, from NOAA records.

Why are my cucumber flowers falling off without fruit?

The first flowers are male. Minnesota and University of Illinois Extension say they normally drop, and Clemson says the first 10 to 20 flowers on a plant are male. Fruit forms only after bees pollinate the later female flowers, which have a tiny cucumber at their base.

Why are my cucumbers bitter?

Clemson says bitterness can come from temperature swings and from the variety, and is strongest at the stem end; it names ‘Diva’ as less prone to it. Minnesota says non-bitter varieties also attract fewer cucumber beetles.

Should cucumbers be grown on a trellis?

Clemson says a trellis keeps fruit clean, reduces disease, frees garden space and makes harvest easier, and uses one about 6 feet high. Minnesota uses a three- to four-foot trellis for straight fruit. Illinois warns that strong wind can make trellising impractical.

How late can I plant cucumbers for a fall crop?

The table counts back 60 days from each zone’s median first fall freeze. Texas A&M AgriLife sows fall cucumbers 10 to 12 weeks before the first freeze, and Clemson’s fall window runs to September 30 in the South Carolina Piedmont.

Sources

Freeze dates on this page are NOAA 1991–2020 Climate Normals, for every station the ZIP codes in each zone cite. Zones are the USDA Plant Hardiness Zone Map, 2023. The planting rules are named beside the table. Growing advice is quoted from the extension publications below, each written for its own area.

• University of Minnesota Extension, Growing cucumbers in home gardens , by Marissa Schuh, Vincent J. Fritz and Carl J. Rosen (Reviewed 2026). Written for: Minnesota (USDA zones 3a–5a).
• University of Illinois Extension, Cucumber (Home Vegetable Gardening) . Written for: Illinois (USDA zones 5a–7a).
• Clemson Cooperative Extension, Home & Garden Information Center, Cucumber (HGIC 1309) (Updated January 23, 2023). Written for: South Carolina (USDA zones 8a–9b).
• UF/IFAS Gardening Solutions, Cucumbers (Accessed October 2026). Written for: Florida (USDA zones 8b–11b).
• Texas A&M AgriLife Extension, Texas Home Vegetable Gardening Guide (EHT-077) , by Joseph Masabni (June 2014). Written for: Texas (USDA zones 6b–10b).

How we write our guides

Published October 27, 2026