Frost dates for Portland, Maine
In a typical year, Portland’s last spring frost lands around Apr 26 and the first fall frost around Oct 15, a growing season of about 172 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 6a.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Apr 16 | Oct 2 |
| 50 percent | Apr 26 | Oct 15 |
| 90 percent | May 7 | Oct 30 |
A 10 percent year is an early year, a 90 percent year a late one. Frost-sensitive planting usually waits for the 90 percent side of the last-frost band.
Soil in Portland is typically around 69°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Portland
- Radish (French Breakfast)
- Chinese cabbage (Bilko)
- Spinach (Space)
- Arugula (Astro)
- Mustard greens (Red Giant)
- Tatsoi (Tatsoi)
- Dill (Bouquet)
- Turnip (Purple Top White Globe)
Timing comes from the same temperature engine the app uses, run against Portland’s normals for today.
Nearby cities
- South Portland, ME (around Apr 26 to Oct 15)
- Lewiston, ME (around May 1 to Oct 10)
- Dover, NH (around May 3 to Oct 10)
- Concord, NH (around May 14 to Sep 29)
- Manchester, NH (around Apr 30 to Oct 11)
Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.
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