Frost dates for 58792Voltaire, ND
The average last spring frost in Voltaire is May 22 and the average first fall frost is September 22, giving a typical growing season of about 123 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Sep 22
- Growing season
- 123 days
Safer after Jun 3 (1-in-10 risk)
Possible by Sep 10 (1-in-10 risk)
Last frost typically in 200 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 13 | Aug 30 · Sep 13 · Sep 23 | 105 days | 100% |
| Frost / freeze (32°F) | May 8 · May 22 · Jun 3 | Sep 10 · Sep 22 · Oct 1 | 123 days | 100% |
| Hard freeze (28°F) | Apr 29 · May 11 · May 26 | Sep 19 · Sep 30 · Oct 12 | 141 days | 100% |
Planting calendar for Voltaire
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 21 – Jun 27 |
| Tomatoes | Transplant outdoors | Jun 7 – Jun 2 |
| Peppers | Start seeds indoors | Apr 21 – May 22 |
| Peppers | Transplant outdoors | Jun 21 – Jul 22 |
| Eggplant | Start seeds indoors | May 8 – Jun 6 |
| Eggplant | Transplant outdoors | Jun 21 – Jul 22 |
| Cucumbers | Sow outdoors | Jun 21 – Jun 12 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jul 5 |
| Sweet corn | Sow outdoors | Jun 7 – Jun 2 |
| Watermelon & cantaloupe | Sow outdoors | Jun 21 – Jul 22 |
| Okra | Sow outdoors | Jun 14 – Jul 7 |
| Peas | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Potatoes | Plant outdoors (spring) | Apr 21 – Jun 21 |
| Onions | Start seeds indoors (spring) | Mar 10 – Apr 6 |
| Onions | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (spring) | Apr 3 – May 7 |
| Broccoli | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (fall) | May 23 – Jun 2 |
| Broccoli | Transplant outdoors (fall) | Jun 22 – Jul 3 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | May 13 – Jun 12 |
| Cabbage | Transplant outdoors (fall) | Jun 12 – Jul 13 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | Jun 12 – Jul 29 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | Jun 29 – Aug 3 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | Jun 12 – Aug 13 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | Jun 5 – Jul 13 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | May 13 – Jun 28 |
| Garlic | Plant outdoors (fall) | Sep 12 – Oct 13 |
Where these dates come from
ZIP code 58792 is matched to the NOAA station Velva, ND, 13.4 km away, at 1,510 ft elevation (98 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Velva, ND (used) | 1,510 ft | May 22 | Sep 22 |
| Butte 5Se, ND | 1,720 ft | May 16 | Sep 28 |
| Granville, ND | 1,510 ft | May 9 | Oct 1 |
| Drake 9 Ne, ND | 1,547 ft | May 12 | Sep 27 |
Frost dates near Voltaire
- Velva, ND 58790 · last May 22, first Sep 22
- Balfour, ND 58712 · last May 12, first Sep 27
- Karlsruhe, ND 58744 · last May 12, first Sep 27
- Butte, ND 58723 · last May 16, first Sep 28
- Sawyer, ND 58781 · last May 22, first Sep 22
- Ruso, ND 58778 · last May 14, first Sep 26
- Benedict, ND 58716 · last May 10, first Sep 28
- Granville, ND 58741 · last May 9, first Oct 1
Frequently asked questions
- When is the last frost in Voltaire, ND?
- For ZIP code 58792, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Velva, ND weather station. There is a 1-in-10 chance of a frost after June 3.
- When is the first frost in Voltaire, ND?
- The average first fall frost (32°F) is September 22. 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 58792?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 123 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.