Frost dates for 58793Westhope, ND
The average last spring frost in Westhope is May 14 and the average first fall frost is September 25, giving a typical growing season of about 133 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 14
- Average first fall frost
- Sep 25
- Growing season
- 133 days
Safer after May 26 (1-in-10 risk)
Possible by Sep 13 (1-in-10 risk)
Last frost typically in 199 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 11 · May 22 · Jun 2 | Sep 7 · Sep 18 · Sep 28 | 118 days | 100% |
| Frost / freeze (32°F) | May 3 · May 14 · May 26 | Sep 13 · Sep 25 · Oct 7 | 133 days | 100% |
| Hard freeze (28°F) | Apr 20 · May 5 · May 17 | Sep 21 · Oct 3 · Oct 15 | 150 days | 100% |
Planting calendar for Westhope
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 13 – Jun 19 |
| Tomatoes | Transplant outdoors | May 30 – Jun 5 |
| Peppers | Start seeds indoors | Apr 13 – May 14 |
| Peppers | Transplant outdoors | Jun 13 – Jul 14 |
| Eggplant | Start seeds indoors | Apr 30 – May 29 |
| Eggplant | Transplant outdoors | Jun 13 – Jul 14 |
| Cucumbers | Sow outdoors | Jun 13 – Jun 15 |
| Summer squash | Sow outdoors | May 30 – Jul 14 |
| Winter squash & pumpkins | Sow outdoors | Jun 13 – Jul 14 |
| Snap beans | Sow outdoors | May 30 – Jul 8 |
| Sweet corn | Sow outdoors | May 30 – Jun 5 |
| Watermelon & cantaloupe | Sow outdoors | Jun 13 – Jul 14 |
| Okra | Sow outdoors | Jun 6 – Jun 29 |
| Peas | Sow outdoors (spring) | Apr 13 – May 29 |
| Potatoes | Plant outdoors (spring) | Apr 13 – Jun 13 |
| Onions | Start seeds indoors (spring) | Mar 2 – Mar 29 |
| Onions | Transplant outdoors (spring) | Apr 30 – May 29 |
| Broccoli | Start seeds indoors (spring) | Mar 26 – Apr 29 |
| Broccoli | Transplant outdoors (spring) | Apr 30 – May 29 |
| Broccoli | Start seeds indoors (fall) | May 26 – Jun 5 |
| Broccoli | Transplant outdoors (fall) | Jun 25 – Jul 6 |
| Cabbage | Start seeds indoors (spring) | Mar 16 – Apr 13 |
| Cabbage | Transplant outdoors (spring) | Apr 13 – May 14 |
| Cabbage | Start seeds indoors (fall) | May 16 – Jun 15 |
| Cabbage | Transplant outdoors (fall) | Jun 15 – Jul 16 |
| Leaf lettuce | Sow outdoors (spring) | Apr 13 – Jun 29 |
| Leaf lettuce | Sow outdoors (fall) | Jun 15 – Aug 1 |
| Spinach | Sow outdoors (spring) | Apr 6 – May 20 |
| Spinach | Sow outdoors (fall) | Jul 2 – Aug 6 |
| Radishes | Sow outdoors (spring) | Apr 13 – Jun 3 |
| Radishes | Sow outdoors (fall) | Jun 15 – Aug 16 |
| Kale | Sow outdoors (spring) | Apr 30 – May 20 |
| Kale | Sow outdoors (fall) | Jun 8 – Jul 16 |
| Carrots | Sow outdoors (spring) | May 14 – Jun 29 |
| Carrots | Sow outdoors (fall) | May 16 – Jul 1 |
| Garlic | Plant outdoors (fall) | Sep 15 – Oct 16 |
Where these dates come from
ZIP code 58793 is matched to the NOAA station Westhope, ND, 1.2 km away, at 1,502 ft elevation (9 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Westhope, ND (used) | 1,502 ft | May 14 | Sep 25 |
| Mohall, ND | 1,641 ft | May 17 | Sep 23 |
| Upham 3 N, ND | 1,425 ft | May 15 | Sep 25 |
| Bottineau, ND | 1,619 ft | May 15 | Sep 25 |
Frost dates near Westhope
- Maxbass, ND 58760 · last May 17, first Sep 23
- Souris, ND 58783 · last May 14, first Sep 25
- Antler, ND 58711 · last May 14, first Sep 25
- Newburg, ND 58762 · last May 15, first Sep 25
- Kramer, ND 58748 · last May 15, first Sep 25
- Lansford, ND 58750 · last May 17, first Sep 23
- Upham, ND 58789 · last May 15, first Sep 25
- Bottineau, ND 58318 · last May 15, first Sep 25
Frequently asked questions
- When is the last frost in Westhope, ND?
- For ZIP code 58793, the average last spring frost (32°F) is May 14, based on NOAA 1991-2020 climate normals for the Westhope, ND weather station. There is a 1-in-10 chance of a frost after May 26.
- When is the first frost in Westhope, ND?
- The average first fall frost (32°F) is September 25. There is a 1-in-10 chance of frost by September 13, so tender plants are at risk from that point on.
- How long is the growing season in 58793?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 133 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.