Frost dates for 58475Pettibone, ND
The average last spring frost in Pettibone is May 15 and the average first fall frost is September 25, giving a typical growing season of about 133 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 15
- Average first fall frost
- Sep 25
- Growing season
- 133 days
Safer after May 28 (1-in-10 risk)
Possible by Sep 12 (1-in-10 risk)
Last frost typically in 193 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 13 · May 25 · Jun 7 | Sep 3 · Sep 17 · Sep 29 | 114 days | 100% |
| Frost / freeze (32°F) | May 4 · May 15 · May 28 | Sep 12 · Sep 25 · Oct 8 | 133 days | 100% |
| Hard freeze (28°F) | Apr 22 · May 5 · May 19 | Sep 22 · Oct 5 · Oct 19 | 151 days | 100% |
Planting calendar for Pettibone
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 14 – Jun 20 |
| Tomatoes | Transplant outdoors | May 31 – Jun 5 |
| Peppers | Start seeds indoors | Apr 14 – May 15 |
| Peppers | Transplant outdoors | Jun 14 – Jul 15 |
| Eggplant | Start seeds indoors | May 1 – May 30 |
| Eggplant | Transplant outdoors | Jun 14 – Jul 15 |
| Cucumbers | Sow outdoors | Jun 14 – Jun 15 |
| Summer squash | Sow outdoors | May 31 – Jul 15 |
| Winter squash & pumpkins | Sow outdoors | Jun 14 – Jul 15 |
| Snap beans | Sow outdoors | May 31 – Jul 8 |
| Sweet corn | Sow outdoors | May 31 – Jun 5 |
| Watermelon & cantaloupe | Sow outdoors | Jun 14 – Jul 15 |
| Okra | Sow outdoors | Jun 7 – Jun 30 |
| Peas | Sow outdoors (spring) | Apr 14 – May 30 |
| Potatoes | Plant outdoors (spring) | Apr 14 – Jun 14 |
| Onions | Start seeds indoors (spring) | Mar 3 – Mar 30 |
| Onions | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (spring) | Mar 27 – Apr 30 |
| Broccoli | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (fall) | May 26 – Jun 5 |
| Broccoli | Transplant outdoors (fall) | Jun 25 – Jul 6 |
| Cabbage | Start seeds indoors (spring) | Mar 17 – Apr 14 |
| Cabbage | Transplant outdoors (spring) | Apr 14 – May 15 |
| Cabbage | Start seeds indoors (fall) | May 16 – Jun 15 |
| Cabbage | Transplant outdoors (fall) | Jun 15 – Jul 16 |
| Leaf lettuce | Sow outdoors (spring) | Apr 14 – Jun 30 |
| Leaf lettuce | Sow outdoors (fall) | Jun 15 – Aug 1 |
| Spinach | Sow outdoors (spring) | Apr 7 – May 21 |
| Spinach | Sow outdoors (fall) | Jul 2 – Aug 6 |
| Radishes | Sow outdoors (spring) | Apr 14 – Jun 4 |
| Radishes | Sow outdoors (fall) | Jun 15 – Aug 16 |
| Kale | Sow outdoors (spring) | May 1 – May 21 |
| Kale | Sow outdoors (fall) | Jun 8 – Jul 16 |
| Carrots | Sow outdoors (spring) | May 15 – Jun 30 |
| Carrots | Sow outdoors (fall) | May 16 – Jul 1 |
| Garlic | Plant outdoors (fall) | Sep 15 – Oct 16 |
Where these dates come from
ZIP code 58475 is matched to the NOAA station Steele 4N, ND, 40.5 km away, at 1,853 ft elevation (3 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Steele 4N, ND (used) | 1,853 ft | May 15 | Sep 25 |
| Tuttle 12Nne, ND | 2,100 ft | May 13 | Sep 29 |
| Jamestown 38 Wsw, ND | 1,920 ft | May 14 | Sep 27 |
| Streeter 5 Nw, ND | 1,961 ft | May 13 | Sep 30 |
Frost dates near Pettibone
- Woodworth, ND 58496 · last May 13, first Sep 30
- Robinson, ND 58478 · last May 15, first Sep 25
- Medina, ND 58467 · last May 13, first Sep 30
- Tappen, ND 58487 · last May 13, first Sep 30
- Dawson, ND 58428 · last May 15, first Sep 25
- Tuttle, ND 58488 · last May 15, first Sep 25
- Sykeston, ND 58486 · last May 12, first Sep 27
- Bowdon, ND 58418 · last May 13, first Sep 28
Frequently asked questions
- When is the last frost in Pettibone, ND?
- For ZIP code 58475, the average last spring frost (32°F) is May 15, based on NOAA 1991-2020 climate normals for the Steele 4N, ND weather station. There is a 1-in-10 chance of a frost after May 28.
- When is the first frost in Pettibone, ND?
- The average first fall frost (32°F) is September 25. There is a 1-in-10 chance of frost by September 12, so tender plants are at risk from that point on.
- How long is the growing season in 58475?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 133 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.