Frost dates for 58241Hensel, ND
The average last spring frost in Hensel is May 12 and the average first fall frost is September 30, giving a typical growing season of about 139 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 12
- Average first fall frost
- Sep 30
- Growing season
- 139 days
Safer after May 27 (1-in-10 risk)
Possible by Sep 17 (1-in-10 risk)
Last frost typically in 190 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 22 · Jun 3 | Sep 8 · Sep 21 · Oct 3 | 121 days | 100% |
| Frost / freeze (32°F) | Apr 29 · May 12 · May 27 | Sep 17 · Sep 30 · Oct 13 | 139 days | 100% |
| Hard freeze (28°F) | Apr 17 · May 2 · May 17 | Sep 27 · Oct 10 · Oct 23 | 158 days | 100% |
Planting calendar for Hensel
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 11 – Jun 17 |
| Tomatoes | Transplant outdoors | May 28 – Jun 10 |
| Peppers | Start seeds indoors | Apr 11 – May 12 |
| Peppers | Transplant outdoors | Jun 11 – Jul 12 |
| Eggplant | Start seeds indoors | Apr 28 – May 27 |
| Eggplant | Transplant outdoors | Jun 11 – Jul 12 |
| Cucumbers | Sow outdoors | Jun 11 – Jun 20 |
| Summer squash | Sow outdoors | May 28 – Jul 12 |
| Winter squash & pumpkins | Sow outdoors | Jun 11 – Jul 12 |
| Snap beans | Sow outdoors | May 28 – Jul 13 |
| Sweet corn | Sow outdoors | May 28 – Jun 10 |
| Watermelon & cantaloupe | Sow outdoors | Jun 11 – Jul 12 |
| Okra | Sow outdoors | Jun 4 – Jun 27 |
| Peas | Sow outdoors (spring) | Apr 11 – May 27 |
| Potatoes | Plant outdoors (spring) | Apr 11 – Jun 11 |
| Onions | Start seeds indoors (spring) | Feb 28 – Mar 27 |
| Onions | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (spring) | Mar 24 – Apr 27 |
| Broccoli | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (fall) | May 31 – Jun 10 |
| Broccoli | Transplant outdoors (fall) | Jun 30 – Jul 11 |
| Cabbage | Start seeds indoors (spring) | Mar 14 – Apr 11 |
| Cabbage | Transplant outdoors (spring) | Apr 11 – May 12 |
| Cabbage | Start seeds indoors (fall) | May 21 – Jun 20 |
| Cabbage | Transplant outdoors (fall) | Jun 20 – Jul 21 |
| Leaf lettuce | Sow outdoors (spring) | Apr 11 – Jun 27 |
| Leaf lettuce | Sow outdoors (fall) | Jun 20 – Aug 6 |
| Spinach | Sow outdoors (spring) | Apr 4 – May 18 |
| Spinach | Sow outdoors (fall) | Jul 7 – Aug 11 |
| Radishes | Sow outdoors (spring) | Apr 11 – Jun 1 |
| Radishes | Sow outdoors (fall) | Jun 20 – Aug 21 |
| Kale | Sow outdoors (spring) | Apr 28 – May 18 |
| Kale | Sow outdoors (fall) | Jun 13 – Jul 21 |
| Carrots | Sow outdoors (spring) | May 12 – Jun 27 |
| Carrots | Sow outdoors (fall) | May 21 – Jul 6 |
| Garlic | Plant outdoors (fall) | Sep 20 – Oct 21 |
Where these dates come from
ZIP code 58241 is matched to the NOAA station Cavalier 7Nw, ND, 15.8 km away, at 899 ft elevation (46 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Cavalier 7Nw, ND (used) | 899 ft | May 12 | Sep 30 |
| Grafton, ND | 827 ft | May 4 | Oct 7 |
| Pembina, ND | 790 ft | May 16 | Sep 29 |
| Langdon Exp Farm, ND | 1,615 ft | May 17 | Sep 26 |
Frost dates near Hensel
- Cavalier, ND 58220 · last May 12, first Sep 30
- Mountain, ND 58262 · last May 12, first Sep 30
- Crystal, ND 58222 · last May 4, first Oct 7
- Glasston, ND 58236 · last May 12, first Sep 30
- Hamilton, ND 58238 · last May 12, first Sep 30
- Walhalla, ND 58282 · last May 12, first Sep 30
- Saint Thomas, ND 58276 · last May 4, first Oct 7
- Bathgate, ND 58216 · last May 12, first Sep 30
Frequently asked questions
- When is the last frost in Hensel, ND?
- For ZIP code 58241, the average last spring frost (32°F) is May 12, based on NOAA 1991-2020 climate normals for the Cavalier 7Nw, ND weather station. There is a 1-in-10 chance of a frost after May 27.
- When is the first frost in Hensel, ND?
- The average first fall frost (32°F) is September 30. There is a 1-in-10 chance of frost by September 17, so tender plants are at risk from that point on.
- How long is the growing season in 58241?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 139 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.