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When to plant brussels sprouts
Start brussels sprouts indoors 4–6 weeks before your last spring frost, then transplant 3 weeks before the frost date.. Enter your ZIP below for exact dates.
The rule
Start indoors; set out 2–4 weeks before the last frost. [src]Cited: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”
Start indoors 4–6 weeks before setting out. [src]Cited: Johnny's Selected Seeds — Seed-Starting Date Calculator chart
Days to maturity: 90–120 days [src]
Method: Start seeds indoors, then transplant. Frost tolerance: frost-hardy (derived from the planting timing above).
Because brussels sprouts is frost-hardy and matures in about 90–120 days, it's a strong fall crop — sow it in mid-to-late summer so it finishes before your first frost.
Brussels Sprouts planting dates by hardiness zone
| Zone | Start indoors | Transplant / sow | Sow for fall |
|---|---|---|---|
| Zone 10a | November 13 – November 27 | December 18 – January 1 | July 14 – July 28 |
| Zone 10b | November 18 – December 2 | December 23 – January 6 | September 6 – September 20 |
| Zone 2a | March 15 – March 29 | April 19 – May 3 | April 19 – May 3 |
| Zone 2b | March 23 – April 6 | April 27 – May 11 | April 27 – May 11 |
| Zone 3b | March 18 – April 1 | April 22 – May 6 | May 1 – May 15 |
| Zone 4a | March 12 – March 26 | April 16 – April 30 | May 9 – May 23 |
| Zone 4b | March 8 – March 22 | April 12 – April 26 | May 12 – May 26 |
| Zone 5a | March 10 – March 24 | April 14 – April 28 | May 13 – May 27 |
| Zone 5b | March 2 – March 16 | April 6 – April 20 | May 20 – June 3 |
| Zone 6a | February 26 – March 12 | April 2 – April 16 | May 27 – June 10 |
| Zone 6b | February 19 – March 5 | March 26 – April 9 | June 1 – June 15 |
| Zone 7a | February 11 – February 25 | March 18 – April 1 | June 7 – June 21 |
| Zone 7b | February 2 – February 16 | March 9 – March 23 | June 13 – June 27 |
| Zone 8a | January 22 – February 5 | February 26 – March 12 | June 20 – July 4 |
| Zone 8b | January 12 – January 26 | February 16 – March 2 | June 27 – July 11 |
| Zone 9a | December 29 – January 12 | February 2 – February 16 | July 7 – July 21 |
| Zone 9b | December 1 – December 15 | January 5 – January 19 | July 20 – August 3 |
What you'll need
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Last verified 2026-07-16. Sources: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”; University of Georgia Extension (days to maturity); NOAA NCEI 1991–2020 Climate Normals (frost); USDA 2023 Plant Hardiness Zone Map.