Planting timing · Cool-season
When to plant radish
Plant radish in spring and fall on the cited sheets — not on a national calendar month. Regional dates 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.
Spacing lives on the radish hub. Timing stays on the cited sheets.
Types and spacing live on growing radish.
What the sources say — at a glance
One source per card. Facts are not averaged.
Clemson HGIC 1305 (South Carolina)
Cool-season. 50–65 °F. Germination 45–85 °F; none above 95 °F. Piedmont Feb 15–Mar 15 and Sept 1–30; Central Feb 1–28 and Sept 1–Oct 25; Coastal Jan 1–Mar 1 and Sept 1–Nov 1.
Details and limits (3)
Timing
Clemson HGIC 1305 (South Carolina): radishes are cool-season. Optimum temperature is 50 to 65 °F. Optimum soil temperature for seed germination is 45 to 85 °F. Radish seed will not germinate when the soil temperature is above 95 °F. Timing on their sheet — not a national plant date.
Regions
Clemson HGIC 1305 (South Carolina): radish planting dates on their sheet — Piedmont February 15 to March 15 and September 1 to 30; Central February 1 to 28 and September 1 to October 25; Coastal January 1 to March 1 and September 1 to November 1. South Carolina regions — not a national plant date.
Limit
South Carolina HGIC 1305. The regional table stays on this sheet. Not a ZIP calendar.
Maryland Extension (Maryland)
Sow as soon as the soil can be worked in spring. Fall also. Maryland timing — not a national plant date.
Details and limits (2)
Timing
Maryland Extension (Maryland): sow seed as soon as the soil can be worked in the spring. Can also be planted in the fall. Maryland timing — not a national plant date.
Limit
Maryland radishes garden page. Soil-worked spring and fall timing stay Maryland. Not a ZIP calendar.
UMN Extension (Minnesota)
Mid-April to mid-May; early August. Direct seed; do not transplant. Minnesota timing — not a national plant date.
Details and limits (2)
Timing
UMN Extension (Minnesota): recommended outdoor planting for radish is mid-April to mid-May, and again in early August. Some plants, such as radishes, carrots and beets, do not tolerate transplanting and will need to be direct seeded. Minnesota timing — not a national plant date.
Limit
Minnesota vegetable-garden planting page. Mid-April to mid-May and early August stay Minnesota. Not a ZIP calendar.
Illinois Extension (Illinois)
Soil-worked until mid-spring. Late-summer sowings. Winter with late turnips, midsummer to late summer. Illinois timing — not a national plant date.
Details and limits (2)
Timing
Illinois Extension (Illinois): spring radishes should be planted from as early as the soil can be worked until mid-spring. Additional sowings of spring types can begin in late summer. Winter radishes are planted at the same time as late turnips (usually midsummer to late summer). Illinois timing — not a national plant date.
Limit
Illinois radish page. Soil-worked-to-mid-spring and late-summer sowings stay 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 a partner is listed, it will be outbound and disclosed. Nothing to buy here. Fertilizer, soils, and pesticides stay off this slot.
When do you plant radish?
Compare timing on the cited sheets. Clemson HGIC 1305 (South Carolina): 50 to 65 °F; Piedmont February 15 to March 15 and September 1 to 30; Central February 1 to 28 and September 1 to October 25; Coastal January 1 to March 1 and September 1 to November 1. Maryland: as soon as the soil can be worked in spring. Minnesota: mid-April to mid-May and early August. Illinois: as early as the soil can be worked until mid-spring.
Do the sheets agree on a fall window?
No. Clemson’s table lists September dates for Piedmont, Central, and Coastal. Maryland names fall. Minnesota names early August. Illinois names late-summer sowings and winter radishes with late turnips. Four cards — not averaged.
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.