Lettuce
Vegetables · Sow outdoors or set out
Lettuce planting dates
At usual odds in 2026: Mar 30 – Sep 18.
The guide's rule 4 weeks before last frost to 6 weeks before first frost.
Frost odds · chance of a freezing night after your spring date
The 2026 season
Start indoors Plant out / sow Frost risk
At all three odds
| Frost odds | Start indoors | Plant / sow |
|---|---|---|
| Bold (1 in 2) | Feb 9 – Aug 25 | Mar 23 – Sep 22 |
| Usual (3 in 10) | Feb 16 – Aug 21 | Mar 30 – Sep 18 |
| Careful (1 in 10) | Feb 24 – Aug 12 | Apr 7 – Sep 9 |
- Days to first harvest
- 25-60 from seed 40-60, after transplanting 25-35
- How it goes in
- Sow outdoors or set out 4-6 weeks indoors to transplant size
- Frost
- Frost-hardy Takes light frost.
- Soil to germinate
- 45-75°F
Plan it in your Garden Book
The book checks your date against the window and tells you when the first harvest could come.
Plus Free Garden Books hold 8 plantings a season; Seed Clock Plus holds 120: $1.95/month or $19.50/year. Free during preview What Plus adds
Source: Montana State University Extension, MontGuide MT199308AG, "Can I Grow That Here? Vegetable Seed and Transplant Schedules for Garden or Container" (reviewed August 2013), read with NOAA 1991-2020 freeze odds for Cleveland Hopkins. Wording ours; how we read the guide.