Frost dates for 58757Mandaree, ND
The average last spring frost in Mandaree is May 20 and the average first fall frost is September 20, giving a typical growing season of about 121 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 20
- Average first fall frost
- Sep 20
- Growing season
- 121 days
Safer after Jun 2 (1-in-10 risk)
Possible by Sep 5 (1-in-10 risk)
Last frost typically in 206 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 17 · May 30 · Jun 20 | Aug 27 · Sep 11 · Sep 23 | 102 days | 100% |
| Frost / freeze (32°F) | May 8 · May 20 · Jun 2 | Sep 5 · Sep 20 · Oct 2 | 121 days | 100% |
| Hard freeze (28°F) | Apr 27 · May 10 · May 24 | Sep 13 · Sep 28 · Oct 14 | 141 days | 100% |
Planting calendar for Mandaree
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 19 – Jun 25 |
| Tomatoes | Transplant outdoors | Jun 5 – May 31 |
| Peppers | Start seeds indoors | Apr 19 – May 20 |
| Peppers | Transplant outdoors | Jun 19 – Jul 20 |
| Eggplant | Start seeds indoors | May 6 – Jun 4 |
| Eggplant | Transplant outdoors | Jun 19 – Jul 20 |
| Cucumbers | Sow outdoors | Jun 19 – Jun 10 |
| Summer squash | Sow outdoors | Jun 5 – Jul 20 |
| Winter squash & pumpkins | Sow outdoors | Jun 19 – Jul 20 |
| Snap beans | Sow outdoors | Jun 5 – Jul 3 |
| Sweet corn | Sow outdoors | Jun 5 – May 31 |
| Watermelon & cantaloupe | Sow outdoors | Jun 19 – Jul 20 |
| Okra | Sow outdoors | Jun 12 – Jul 5 |
| Peas | Sow outdoors (spring) | Apr 19 – Jun 4 |
| Potatoes | Plant outdoors (spring) | Apr 19 – Jun 19 |
| Onions | Start seeds indoors (spring) | Mar 8 – Apr 4 |
| Onions | Transplant outdoors (spring) | May 6 – Jun 4 |
| Broccoli | Start seeds indoors (spring) | Apr 1 – May 5 |
| Broccoli | Transplant outdoors (spring) | May 6 – Jun 4 |
| Broccoli | Start seeds indoors (fall) | May 21 – May 31 |
| Broccoli | Transplant outdoors (fall) | Jun 20 – Jul 1 |
| Cabbage | Start seeds indoors (spring) | Mar 22 – Apr 19 |
| Cabbage | Transplant outdoors (spring) | Apr 19 – May 20 |
| Cabbage | Start seeds indoors (fall) | May 11 – Jun 10 |
| Cabbage | Transplant outdoors (fall) | Jun 10 – Jul 11 |
| Leaf lettuce | Sow outdoors (spring) | Apr 19 – Jul 5 |
| Leaf lettuce | Sow outdoors (fall) | Jun 10 – Jul 27 |
| Spinach | Sow outdoors (spring) | Apr 12 – May 26 |
| Spinach | Sow outdoors (fall) | Jun 27 – Aug 1 |
| Radishes | Sow outdoors (spring) | Apr 19 – Jun 9 |
| Radishes | Sow outdoors (fall) | Jun 10 – Aug 11 |
| Kale | Sow outdoors (spring) | May 6 – May 26 |
| Kale | Sow outdoors (fall) | Jun 3 – Jul 11 |
| Carrots | Sow outdoors (spring) | May 20 – Jul 5 |
| Carrots | Sow outdoors (fall) | May 11 – Jun 26 |
| Garlic | Plant outdoors (fall) | Sep 10 – Oct 11 |
Where these dates come from
ZIP code 58757 is matched to the NOAA station Keene 3S, ND, 26.1 km away, at 2,470 ft elevation (298 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Keene 3S, ND (used) | 2,470 ft | May 20 | Sep 20 |
| Killdeer, ND | 2,310 ft | May 21 | Sep 23 |
| Dunn Ctr 1E, ND | 2,187 ft | May 20 | Sep 21 |
| Watford City 14S, ND | 2,027 ft | May 22 | Sep 17 |
Frost dates near Mandaree
- Keene, ND 58847 · last May 20, first Sep 20
- New Town, ND 58763 · last May 17, first Sep 23
- Killdeer, ND 58640 · last May 21, first Sep 23
- Dunn Center, ND 58626 · last May 20, first Sep 21
- Watford City, ND 58854 · last May 9, first Sep 27
- Parshall, ND 58770 · last May 17, first Sep 23
- Halliday, ND 58636 · last May 20, first Sep 21
- Grassy Butte, ND 58634 · last May 18, first Sep 23
Frequently asked questions
- When is the last frost in Mandaree, ND?
- For ZIP code 58757, the average last spring frost (32°F) is May 20, based on NOAA 1991-2020 climate normals for the Keene 3S, ND weather station. There is a 1-in-10 chance of a frost after June 2.
- When is the first frost in Mandaree, ND?
- The average first fall frost (32°F) is September 20. There is a 1-in-10 chance of frost by September 5, so tender plants are at risk from that point on.
- How long is the growing season in 58757?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 121 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.