Frost dates for 58622Belfield, ND
The average last spring frost in Belfield is May 9 and the average first fall frost is September 30, giving a typical growing season of about 142 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 9
- Average first fall frost
- Sep 30
- Growing season
- 142 days
Safer after May 21 (1-in-10 risk)
Possible by Sep 15 (1-in-10 risk)
Last frost typically in 193 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 9 · May 19 · Jun 2 | Sep 9 · Sep 22 · Oct 3 | 123 days | 100% |
| Frost / freeze (32°F) | Apr 30 · May 9 · May 21 | Sep 15 · Sep 30 · Oct 13 | 142 days | 100% |
| Hard freeze (28°F) | Apr 17 · Apr 30 · May 11 | Sep 24 · Oct 9 · Oct 23 | 161 days | 100% |
Planting calendar for Belfield
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 8 – Jun 14 |
| Tomatoes | Transplant outdoors | May 25 – Jun 10 |
| Peppers | Start seeds indoors | Apr 8 – May 9 |
| Peppers | Transplant outdoors | Jun 8 – Jul 9 |
| Eggplant | Start seeds indoors | Apr 25 – May 24 |
| Eggplant | Transplant outdoors | Jun 8 – Jul 9 |
| Cucumbers | Sow outdoors | Jun 8 – Jun 20 |
| Summer squash | Sow outdoors | May 25 – Jul 9 |
| Winter squash & pumpkins | Sow outdoors | Jun 8 – Jul 9 |
| Snap beans | Sow outdoors | May 25 – Jul 13 |
| Sweet corn | Sow outdoors | May 25 – Jun 10 |
| Watermelon & cantaloupe | Sow outdoors | Jun 8 – Jul 9 |
| Okra | Sow outdoors | Jun 1 – Jun 24 |
| Peas | Sow outdoors (spring) | Apr 8 – May 24 |
| Potatoes | Plant outdoors (spring) | Apr 8 – Jun 8 |
| Onions | Start seeds indoors (spring) | Feb 25 – Mar 24 |
| Onions | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (spring) | Mar 21 – Apr 24 |
| Broccoli | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (fall) | May 31 – Jun 10 |
| Broccoli | Transplant outdoors (fall) | Jun 30 – Jul 11 |
| Cabbage | Start seeds indoors (spring) | Mar 11 – Apr 8 |
| Cabbage | Transplant outdoors (spring) | Apr 8 – May 9 |
| Cabbage | Start seeds indoors (fall) | May 21 – Jun 20 |
| Cabbage | Transplant outdoors (fall) | Jun 20 – Jul 21 |
| Leaf lettuce | Sow outdoors (spring) | Apr 8 – Jun 24 |
| Leaf lettuce | Sow outdoors (fall) | Jun 20 – Aug 6 |
| Spinach | Sow outdoors (spring) | Apr 1 – May 15 |
| Spinach | Sow outdoors (fall) | Jul 7 – Aug 11 |
| Radishes | Sow outdoors (spring) | Apr 8 – May 29 |
| Radishes | Sow outdoors (fall) | Jun 20 – Aug 21 |
| Kale | Sow outdoors (spring) | Apr 25 – May 15 |
| Kale | Sow outdoors (fall) | Jun 13 – Jul 21 |
| Carrots | Sow outdoors (spring) | May 9 – Jun 24 |
| Carrots | Sow outdoors (fall) | May 21 – Jul 6 |
| Garlic | Plant outdoors (fall) | Sep 20 – Oct 21 |
Where these dates come from
ZIP code 58622 is matched to the NOAA station Medora 7 E, ND, 20.8 km away, at 2,771 ft elevation (87 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Medora 7 E, ND (used) | 2,771 ft | May 9 | Sep 30 |
| Theodore Roosevelt Ap, ND | 2,580 ft | May 18 | Sep 25 |
| Dickinson, ND | 2,460 ft | May 20 | Sep 22 |
| Medora, ND | 2,268 ft | May 19 | Sep 20 |
Frost dates near Belfield
- South Heart, ND 58655 · last May 18, first Sep 25
- Dickinson, ND 58602 · last May 20, first Sep 22
- Medora, ND 58645 · last May 19, first Sep 20
- New England, ND 58647 · last May 16, first Sep 24
- Amidon, ND 58620 · last May 12, first Sep 29
- Gladstone, ND 58630 · last May 23, first Sep 20
- Fairfield, ND 58627 · last May 12, first Sep 28
- Manning, ND 58642 · last May 18, first Sep 24
Frequently asked questions
- When is the last frost in Belfield, ND?
- For ZIP code 58622, the average last spring frost (32°F) is May 9, based on NOAA 1991-2020 climate normals for the Medora 7 E, ND weather station. There is a 1-in-10 chance of a frost after May 21.
- When is the first frost in Belfield, ND?
- The average first fall frost (32°F) is September 30. There is a 1-in-10 chance of frost by September 15, so tender plants are at risk from that point on.
- How long is the growing season in 58622?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 142 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.