Frost dates for 58652Richardton, ND
The average last spring frost in Richardton is May 9 and the average first fall frost is October 1, giving a typical growing season of about 145 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 9
- Average first fall frost
- Oct 1
- Growing season
- 145 days
Safer after May 23 (1-in-10 risk)
Possible by Sep 18 (1-in-10 risk)
Last frost typically in 189 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 7 · May 19 · Jun 1 | Sep 10 · Sep 24 · Oct 5 | 127 days | 100% |
| Frost / freeze (32°F) | Apr 28 · May 9 · May 23 | Sep 18 · Oct 1 · Oct 15 | 145 days | 100% |
| Hard freeze (28°F) | Apr 16 · Apr 30 · May 12 | Sep 27 · Oct 10 · Oct 23 | 163 days | 100% |
Planting calendar for Richardton
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 8 – Jun 14 |
| Tomatoes | Transplant outdoors | May 25 – Jun 11 |
| Peppers | Start seeds indoors | Apr 8 – May 9 |
| Peppers | Transplant outdoors | Jun 8 – Jul 9 |
| Eggplant | Start seeds indoors | Apr 25 – May 24 |
| Eggplant | Transplant outdoors | Jun 8 – Jul 9 |
| Cucumbers | Sow outdoors | Jun 8 – Jun 21 |
| Summer squash | Sow outdoors | May 25 – Jul 9 |
| Winter squash & pumpkins | Sow outdoors | Jun 8 – Jul 9 |
| Snap beans | Sow outdoors | May 25 – Jul 14 |
| Sweet corn | Sow outdoors | May 25 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 8 – Jul 9 |
| Okra | Sow outdoors | Jun 1 – Jun 24 |
| Peas | Sow outdoors (spring) | Apr 8 – May 24 |
| Potatoes | Plant outdoors (spring) | Apr 8 – Jun 8 |
| Onions | Start seeds indoors (spring) | Feb 25 – Mar 24 |
| Onions | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (spring) | Mar 21 – Apr 24 |
| Broccoli | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 11 – Apr 8 |
| Cabbage | Transplant outdoors (spring) | Apr 8 – May 9 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 8 – Jun 24 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 1 – May 15 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 8 – May 29 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | Apr 25 – May 15 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 9 – Jun 24 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 58652 is matched to the NOAA station Richardton Abbey, ND, 5.5 km away, at 2,470 ft elevation (13 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Richardton Abbey, ND (used) | 2,470 ft | May 9 | Oct 1 |
| Hebron, ND | 2,160 ft | May 19 | Sep 21 |
| Taylor 7 Nnw, ND | 2,220 ft | May 23 | Sep 20 |
| Dickinson, ND | 2,460 ft | May 20 | Sep 22 |
Frost dates near Richardton
- Taylor, ND 58656 · last May 9, first Oct 1
- Gladstone, ND 58630 · last May 23, first Sep 20
- Hebron, ND 58638 · last May 19, first Sep 21
- Lefor, ND 58641 · last May 18, first Sep 25
- Marshall, ND 58644 · last May 23, first Sep 20
- Dickinson, ND 58601 · last May 18, first Sep 25
- Glen Ullin, ND 58631 · last May 19, first Sep 21
- Manning, ND 58642 · last May 18, first Sep 24
Frequently asked questions
- When is the last frost in Richardton, ND?
- For ZIP code 58652, the average last spring frost (32°F) is May 9, based on NOAA 1991-2020 climate normals for the Richardton Abbey, ND weather station. There is a 1-in-10 chance of a frost after May 23.
- When is the first frost in Richardton, ND?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 18, so tender plants are at risk from that point on.
- How long is the growing season in 58652?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 145 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.