Frost dates for 58006Arthur, ND
The average last spring frost in Arthur is May 9 and the average first fall frost is October 1, giving a typical growing season of about 143 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 9
- Average first fall frost
- Oct 1
- Growing season
- 143 days
Safer after May 21 (1-in-10 risk)
Possible by Sep 17 (1-in-10 risk)
Last frost typically in 191 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 4 · May 18 · May 29 | Sep 10 · Sep 22 · Oct 3 | 126 days | 100% |
| Frost / freeze (32°F) | Apr 25 · May 9 · May 21 | Sep 17 · Oct 1 · Oct 15 | 143 days | 100% |
| Hard freeze (28°F) | Apr 12 · Apr 29 · May 13 | Sep 26 · Oct 10 · Oct 24 | 163 days | 100% |
Planting calendar for Arthur
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 58006 is matched to the NOAA station Casselton Agronomy Farm, ND, 25.4 km away, at 935 ft elevation (39 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Casselton Agronomy Farm, ND (used) | 935 ft | May 9 | Oct 1 |
| Georgetown 1 E, MN | 885 ft | May 9 | Oct 1 |
| Fargo Hector Intl Ap, ND | 900 ft | May 10 | Sep 30 |
| Colgate, ND | 1,180 ft | May 10 | Sep 24 |
Frost dates near Arthur
- Amenia, ND 58004 · last May 9, first Oct 1
- Hunter, ND 58048 · last May 2, first Oct 9
- Erie, ND 58029 · last May 10, first Sep 24
- Gardner, ND 58036 · last May 9, first Oct 1
- Grandin, ND 58038 · last May 9, first Oct 1
- Absaraka, ND 58002 · last May 9, first Oct 1
- Ayr, ND 58007 · last May 10, first Sep 24
- Casselton, ND 58012 · last May 9, first Oct 1
Frequently asked questions
- When is the last frost in Arthur, ND?
- For ZIP code 58006, the average last spring frost (32°F) is May 9, based on NOAA 1991-2020 climate normals for the Casselton Agronomy Farm, ND weather station. There is a 1-in-10 chance of a frost after May 21.
- When is the first frost in Arthur, ND?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 17, so tender plants are at risk from that point on.
- How long is the growing season in 58006?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 143 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.