Frost dates for Grand Forks, North Dakota
In a typical year, Grand Forks’s last spring frost lands around May 10 and the first fall frost around Oct 1, a growing season of about 144 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 4a.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Apr 28 | Sep 20 |
| 50 percent | May 10 | Oct 1 |
| 90 percent | May 24 | Oct 15 |
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 Grand Forks is typically around 68°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Grand Forks
- Radish (Cherry Belle)
- Bok choy (Toy Choi)
- Spinach (Space)
- Arugula (Astro)
- Lettuce (Black Seeded Simpson)
- Mustard greens (Red Giant)
- Tatsoi (Tatsoi)
- Swiss chard (Fordhook Giant)
Timing comes from the same temperature engine the app uses, run against Grand Forks’s normals for today.
Nearby cities
- Fargo, ND (around May 5 to Oct 3)
- Aberdeen, SD (around May 7 to Sep 29)
- Bismarck, ND (around May 10 to Sep 30)
- Minot, ND (around May 10 to Oct 1)
- Duluth, MN (around May 14 to Oct 12)
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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