Frost dates for 58580Zap, ND
The average last spring frost in Zap is May 21 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 21
- Average first fall frost
- Sep 20
- Growing season
- 121 days
Safer after Jun 3 (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 18 · May 31 · Jun 17 | Aug 24 · Sep 10 · Sep 23 | 100 days | 100% |
| Frost / freeze (32°F) | May 7 · May 21 · Jun 3 | Sep 5 · Sep 20 · Oct 4 | 121 days | 100% |
| Hard freeze (28°F) | Apr 27 · May 11 · May 25 | Sep 14 · Sep 28 · Oct 14 | 142 days | 100% |
Planting calendar for Zap
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 20 – Jun 26 |
| Tomatoes | Transplant outdoors | Jun 6 – May 31 |
| Peppers | Start seeds indoors | Apr 20 – May 21 |
| Peppers | Transplant outdoors | Jun 20 – Jul 21 |
| Eggplant | Start seeds indoors | May 7 – Jun 5 |
| Eggplant | Transplant outdoors | Jun 20 – Jul 21 |
| Cucumbers | Sow outdoors | Jun 20 – Jun 10 |
| Summer squash | Sow outdoors | Jun 6 – Jul 21 |
| Winter squash & pumpkins | Sow outdoors | Jun 20 – Jul 21 |
| Snap beans | Sow outdoors | Jun 6 – Jul 3 |
| Sweet corn | Sow outdoors | Jun 6 – May 31 |
| Watermelon & cantaloupe | Sow outdoors | Jun 20 – Jul 21 |
| Okra | Sow outdoors | Jun 13 – Jul 6 |
| Peas | Sow outdoors (spring) | Apr 20 – Jun 5 |
| Potatoes | Plant outdoors (spring) | Apr 20 – Jun 20 |
| Onions | Start seeds indoors (spring) | Mar 9 – Apr 5 |
| Onions | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (spring) | Apr 2 – May 6 |
| Broccoli | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (fall) | May 21 – May 31 |
| Broccoli | Transplant outdoors (fall) | Jun 20 – Jul 1 |
| Cabbage | Start seeds indoors (spring) | Mar 23 – Apr 20 |
| Cabbage | Transplant outdoors (spring) | Apr 20 – May 21 |
| Cabbage | Start seeds indoors (fall) | May 11 – Jun 10 |
| Cabbage | Transplant outdoors (fall) | Jun 10 – Jul 11 |
| Leaf lettuce | Sow outdoors (spring) | Apr 20 – Jul 6 |
| Leaf lettuce | Sow outdoors (fall) | Jun 10 – Jul 27 |
| Spinach | Sow outdoors (spring) | Apr 13 – May 27 |
| Spinach | Sow outdoors (fall) | Jun 27 – Aug 1 |
| Radishes | Sow outdoors (spring) | Apr 20 – Jun 10 |
| Radishes | Sow outdoors (fall) | Jun 10 – Aug 11 |
| Kale | Sow outdoors (spring) | May 7 – May 27 |
| Kale | Sow outdoors (fall) | Jun 3 – Jul 11 |
| Carrots | Sow outdoors (spring) | May 21 – Jul 6 |
| Carrots | Sow outdoors (fall) | May 11 – Jun 26 |
| Garlic | Plant outdoors (fall) | Sep 10 – Oct 11 |
Where these dates come from
ZIP code 58580 is matched to the NOAA station Beulah 1 W, ND, 10.6 km away, at 1,785 ft elevation (101 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Beulah 1 W, ND (used) | 1,785 ft | May 21 | Sep 20 |
| Hebron, ND | 2,160 ft | May 19 | Sep 21 |
| Riverdale, ND | 1,962 ft | May 12 | Oct 3 |
| Dunn Ctr 1E, ND | 2,187 ft | May 20 | Sep 21 |
Frost dates near Zap
- Beulah, ND 58523 · last May 21, first Sep 20
- Golden Valley, ND 58541 · last May 21, first Sep 20
- Dodge, ND 58625 · last May 20, first Sep 21
- Hazen, ND 58545 · last May 21, first Sep 20
- Halliday, ND 58636 · last May 20, first Sep 21
- Marshall, ND 58644 · last May 23, first Sep 20
- Stanton, ND 58571 · last May 12, first Sep 30
- Hebron, ND 58638 · last May 19, first Sep 21
Frequently asked questions
- When is the last frost in Zap, ND?
- For ZIP code 58580, the average last spring frost (32°F) is May 21, based on NOAA 1991-2020 climate normals for the Beulah 1 W, ND weather station. There is a 1-in-10 chance of a frost after June 3.
- When is the first frost in Zap, 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 58580?
- 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.