Planting timing · Frost-anchored
When to plant cucumbers
Plant cucumbers after frost risk has passed and the soil has warmed on the cited sheets — not on a national calendar month. Indoor-start windows and second plantings stay source-specific.
Growing guidance is general information. Timing, spacing, and care depend on cultivar, weather, soil, and local conditions. Check the sources and adjust the plan for your garden.
Your window
Use your last-spring-frost history — not a national month.
A ZIP calculator is not live on this page. Save the bed to store the window you actually used.
Sow after frost risk at your site. Spacing lives on the cucumber hub.
Types and spacing live on growing cucumbers.
What the sources say — at a glance
One source per card. Facts are not averaged.
Clemson HGIC 1309 (South Carolina)
After frost and soil 70 °F. No germ below 50 °F. Indoor 2–3 weeks. Spring and fall crops.
Details and limits (2)
Timing
Clemson HGIC 1309 (South Carolina): cucumber is a warm-season vegetable. Plants are very tender and can be killed by light frosts. Plant seed or transplants after the fear of frost has passed and the soil temperature has reached 70 °F. Seeds will not germinate at soil temperatures below 50 °F. Seeds may be started indoors two to three weeks prior to planting outdoors. Spring and fall crops may be grown. Timing on their sheet — not a national plant date.
Limit
South Carolina HGIC 1309. Soil 70 °F and indoor 2–3 weeks stay on this sheet. Not a ZIP calendar.
Maryland Extension (Maryland)
After frost, soil warmed. Indoor 3 weeks. Handle transplants gently. Second crop around July 1. 50–65 days from seed.
Details and limits (4)
Timing
Maryland Extension (Maryland): seed directly after danger of frost has passed and soil has warmed, or use plants grown indoors 3 weeks prior to planting time. Handle transplants gently and disturb the root system as little as possible. Timing on their sheet — not a national plant date.
Succession
Maryland Extension (Maryland): plant a second crop around July 1. Maryland sheet — not a national plant date and not a frost engine.
Maturity
Maryland Extension (Maryland): days to maturity 50–65 from seed. Source range — not how long yours takes.
Limit
Maryland cucumber garden page. July 1 is Maryland geography. Not a ZIP calendar.
UMN Extension (Minnesota)
After last frost. Soil ≥70 °F at 1 in. Late May in most of Minnesota. Indoor ≤4 weeks. Peat pots.
Details and limits (3)
Timing
UMN Extension (Minnesota): sow after the last frost date, once the soil is at least 70 °F at the one-inch depth. In most of Minnesota, this will be sometime in late May. Timing on their sheet — not a national plant date.
Start
UMN Extension (Minnesota): cucumber seeds will not germinate in cold soil. Plants cannot survive freezing temperatures; set plants out after the last frost date. Start seeds indoors no earlier than four weeks before the last frost date. Start the seeds in peat pots that you can plant directly into the soil. Transplant carefully before the plant outgrows its container. Do not damage the cucumber’s taproot. Timing on their sheet — not a national plant date.
Limit
Minnesota cucumber sheet. Late May is Minnesota geography. Not a ZIP calendar.
Illinois Extension (Illinois)
After frost, soil warmed. Second planting mid–late summer. Indoor 3–4 weeks. True leaves 2–4. No oversized pots. Not bare-root.
Details and limits (3)
Timing
Illinois Extension (Illinois): plant after the danger of frost has passed, and the soil has warmed in the spring. Warm soil is necessary for germination. A second planting for fall harvest may be made in mid- to late summer. Timing on their sheet — not a national plant date.
Start
Illinois Extension (Illinois): sow two or three seeds in containers 3 to 4 weeks before the frost-free date. Thin to one plant per container. Plant transplants when they have two to four true leaves. Do not allow transplants to get too large in containers. Their sheet does not use bare-root plants. Timing on their sheet — not a national plant date.
Limit
Illinois cucumber page. Mid- to late-summer second planting stays Illinois. Not a ZIP calendar.
Sources differ
Make it yours
Save the bed in the Field Book so next season is not a guess.
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When do you plant cucumbers?
Compare frost and soil cues on the cited sheets. Clemson HGIC 1309 (South Carolina): after frost and soil 70 °F. Minnesota: after last frost, soil at least 70 °F at one inch; late May in most of Minnesota. Maryland and Illinois: after frost, soil warmed.
Can you plant a second cucumber crop?
Two sheets name a second planting, as geography not a national date. Maryland: around July 1. Illinois: mid- to late summer for fall harvest.
What to record in the Field Book
Save the bed with the crop and the date. You may add a photo and notes. Compare entries you have recorded with each other — not with a diagnosis from this page. If you want an identification, bring the record to local Extension.
How we know — methodology. Ranges and assertions are cited per source, not blended.