Planting timing · Cool-season
When to plant Brussels sprouts
Plant Brussels sprouts in late summer 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 Brussels sprouts hub. Timing stays on the cited sheets.
Types and spacing live on growing Brussels sprouts.
What the sources say — at a glance
One source per card. Facts are not averaged.
Clemson HGIC (South Carolina)
65–80 °F. Late summer through fall in the South. Upstate Aug 15–Sep 15; Coastal Plain Sep 15–Oct 15.
Details and limits (3)
Timing
Clemson HGIC (South Carolina) says they grow best at cooler temperatures, 65 to 80 °F. Late summer through fall is the best growing season in the South. Timing on their sheet — not a national plant date.
Regions
Clemson HGIC (South Carolina): set out transplants August 15 to September 15 in the Upstate and September 15 to October 15 in the Coastal Plain. South Carolina regions — not a national plant date.
Limit
South Carolina HGIC blog. 65–80 °F stays Clemson’s cited condition. Not a ZIP calendar.
Maryland Extension (Maryland)
4–6 week transplants 90–100 days before first frost. +20 days if direct seed. Maryland timing — not a national plant date.
Details and limits (2)
Timing
Maryland Extension (Maryland): grow 4- to 6-week-old transplants to plant in the garden 90 to 100 days before the first frost date. Add 20 days if direct seeding. Maryland timing — not a national plant date.
Limit
Maryland Brussels sprouts garden page. Frost-date wording stays Maryland. Not a ZIP calendar.
UMN Extension (Minnesota)
June indoor or direct seed. Minnesota timing — not a national plant date.
Details and limits (2)
Timing
UMN Extension (Minnesota): Brussels sprouts are a fall crop in Minnesota. Sow seeds in June, indoors or directly in the garden. Minnesota timing — not a national plant date.
Limit
Minnesota Brussels sprouts page. June start stays Minnesota. Not a ZIP calendar.
Illinois Extension (Illinois)
Early to midsummer transplants. 90–100 days before first frost. Illinois timing — not a national plant date.
Details and limits (2)
Timing
Illinois Extension (Illinois): transplant in early summer to midsummer about the same time that you would plant late, long-season cabbage. At least 90 to 100 days before the first frost date. Illinois timing — not a national plant date. Illinois’s attributed frost-date wording — not a planting-safety promise.
Limit
Illinois Brussels sprouts page. Early-to-midsummer timing 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 Brussels sprouts?
Compare timing on the cited sheets. Clemson HGIC (South Carolina): 65 to 80 °F; late summer through fall in the South; Upstate August 15 to September 15; Coastal Plain September 15 to October 15. Maryland: 4- to 6-week-old transplants 90 to 100 days before the first frost date. Minnesota: June. Illinois: early to midsummer.
Do the sheets agree on a window?
No. Clemson names late summer through fall in the South, with Upstate and Coastal Plain dates. Maryland names 90 to 100 days before the first frost date. Minnesota names June. Illinois names early to midsummer. 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.