Frost dates for 58734Donnybrook, ND
The average last spring frost in Donnybrook is May 15 and the average first fall frost is September 23, giving a typical growing season of about 129 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 15
- Average first fall frost
- Sep 23
- Growing season
- 129 days
Safer after May 28 (1-in-10 risk)
Possible by Sep 10 (1-in-10 risk)
Last frost typically in 201 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 12 · May 24 · Jun 5 | Sep 1 · Sep 14 · Sep 25 | 112 days | 100% |
| Frost / freeze (32°F) | May 3 · May 15 · May 28 | Sep 10 · Sep 23 · Oct 4 | 129 days | 100% |
| Hard freeze (28°F) | Apr 22 · May 5 · May 19 | Sep 18 · Oct 1 · Oct 14 | 148 days | 100% |
Planting calendar for Donnybrook
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 14 – Jun 20 |
| Tomatoes | Transplant outdoors | May 31 – Jun 3 |
| Peppers | Start seeds indoors | Apr 14 – May 15 |
| Peppers | Transplant outdoors | Jun 14 – Jul 15 |
| Eggplant | Start seeds indoors | May 1 – May 30 |
| Eggplant | Transplant outdoors | Jun 14 – Jul 15 |
| Cucumbers | Sow outdoors | Jun 14 – Jun 13 |
| Summer squash | Sow outdoors | May 31 – Jul 15 |
| Winter squash & pumpkins | Sow outdoors | Jun 14 – Jul 15 |
| Snap beans | Sow outdoors | May 31 – Jul 6 |
| Sweet corn | Sow outdoors | May 31 – Jun 3 |
| Watermelon & cantaloupe | Sow outdoors | Jun 14 – Jul 15 |
| Okra | Sow outdoors | Jun 7 – Jun 30 |
| Peas | Sow outdoors (spring) | Apr 14 – May 30 |
| Potatoes | Plant outdoors (spring) | Apr 14 – Jun 14 |
| Onions | Start seeds indoors (spring) | Mar 3 – Mar 30 |
| Onions | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (spring) | Mar 27 – Apr 30 |
| Broccoli | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (fall) | May 24 – Jun 3 |
| Broccoli | Transplant outdoors (fall) | Jun 23 – Jul 4 |
| Cabbage | Start seeds indoors (spring) | Mar 17 – Apr 14 |
| Cabbage | Transplant outdoors (spring) | Apr 14 – May 15 |
| Cabbage | Start seeds indoors (fall) | May 14 – Jun 13 |
| Cabbage | Transplant outdoors (fall) | Jun 13 – Jul 14 |
| Leaf lettuce | Sow outdoors (spring) | Apr 14 – Jun 30 |
| Leaf lettuce | Sow outdoors (fall) | Jun 13 – Jul 30 |
| Spinach | Sow outdoors (spring) | Apr 7 – May 21 |
| Spinach | Sow outdoors (fall) | Jun 30 – Aug 4 |
| Radishes | Sow outdoors (spring) | Apr 14 – Jun 4 |
| Radishes | Sow outdoors (fall) | Jun 13 – Aug 14 |
| Kale | Sow outdoors (spring) | May 1 – May 21 |
| Kale | Sow outdoors (fall) | Jun 6 – Jul 14 |
| Carrots | Sow outdoors (spring) | May 15 – Jun 30 |
| Carrots | Sow outdoors (fall) | May 14 – Jun 29 |
| Garlic | Plant outdoors (fall) | Sep 13 – Oct 14 |
Where these dates come from
ZIP code 58734 is matched to the NOAA station Kenmare 1 Wsw, ND, 24.8 km away, at 1,810 ft elevation (208 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Kenmare 1 Wsw, ND (used) | 1,810 ft | May 15 | Sep 23 |
| Foxholm 7 N, ND | 1,675 ft | May 11 | Sep 29 |
| Stanley 3 Nnw, ND | 2,280 ft | May 17 | Sep 23 |
| Mohall, ND | 1,641 ft | May 17 | Sep 23 |
Frost dates near Donnybrook
- Carpio, ND 58725 · last May 11, first Sep 29
- Berthold, ND 58718 · last May 11, first Sep 29
- Kenmare, ND 58746 · last May 15, first Sep 23
- Palermo, ND 58769 · last May 17, first Sep 23
- Mohall, ND 58761 · last May 17, first Sep 23
- Tolley, ND 58787 · last May 15, first Sep 23
- Des Lacs, ND 58733 · last May 13, first Sep 27
- Lansford, ND 58750 · last May 17, first Sep 23
Frequently asked questions
- When is the last frost in Donnybrook, ND?
- For ZIP code 58734, the average last spring frost (32°F) is May 15, based on NOAA 1991-2020 climate normals for the Kenmare 1 Wsw, ND weather station. There is a 1-in-10 chance of a frost after May 28.
- When is the first frost in Donnybrook, ND?
- The average first fall frost (32°F) is September 23. There is a 1-in-10 chance of frost by September 10, so tender plants are at risk from that point on.
- How long is the growing season in 58734?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 129 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.