The last 36°F Spring frost date is 30% likely to be on May 21. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on May 11. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Grafton, ND are based on historical climate data.
Always check your local forecast for the most up-to-date frost warnings.
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The last spring frost signals when your area is safe from freezing temperatures. Tender plants can now grow outdoors without cold damage! This marks the beginning of the growing season. Last spring frost serves as your essential starting point for planting warm-season crops. It's also time to remove winter protection from your perennials. Enjoy the longer days and warmer weather!
Start seeds indoors several weeks before your last frost date. This gives plants time to reach transplanting size when weather permits. Plan your outdoor planting schedule around your area's average last frost date. Plant some crops before and some after this date to protect against weather changes. Look for spots in your yard where frost stays longer or disappears earlier. Create your own frost map to use all available growing space and extend your season. Keep watching your local weather forecast to catch any surprise late frosts.
| Probability of frost (36°F) on or after… | |
|---|---|
| 10% chance | May 31 |
| 20% chance | May 26 |
| 30% chance | May 21 |
| 40% chance | May 17 |
| 50% chance | May 14 |
| 60% chance | May 11 |
| 70% chance | May 8 |
| 80% chance | May 5 |
| 90% chance | Apr 30 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 20 |
| 20% chance | May 15 |
| 30% chance | May 11 |
| 40% chance | May 7 |
| 50% chance | May 4 |
| 60% chance | May 2 |
| 70% chance | Apr 29 |
| 80% chance | Apr 26 |
| 90% chance | Apr 20 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | May 11 |
| 20% chance | May 5 |
| 30% chance | May 2 |
| 40% chance | Apr 29 |
| 50% chance | Apr 26 |
| 60% chance | Apr 23 |
| 70% chance | Apr 20 |
| 80% chance | Apr 15 |
| 90% chance | Apr 9 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | May 2 |
| 20% chance | Apr 28 |
| 30% chance | Apr 23 |
| 40% chance | Apr 20 |
| 50% chance | Apr 16 |
| 60% chance | Apr 13 |
| 70% chance | Apr 9 |
| 80% chance | Apr 6 |
| 90% chance | Apr 1 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Apr 22 |
| 20% chance | Apr 17 |
| 30% chance | Apr 13 |
| 40% chance | Apr 10 |
| 50% chance | Apr 7 |
| 60% chance | Apr 5 |
| 70% chance | Apr 3 |
| 80% chance | Mar 31 |
| 90% chance | Mar 25 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Apr 14 |
| 20% chance | Apr 9 |
| 30% chance | Apr 7 |
| 40% chance | Apr 4 |
| 50% chance | Apr 2 |
| 60% chance | Mar 31 |
| 70% chance | Mar 28 |
| 80% chance | Mar 23 |
| 90% chance | Mar 18 |
Agricultural climatic data from weather station: GRAFTON (USC00323594)