Frost dates for 58230Finley, ND
The average last spring frost in Finley is May 17 and the average first fall frost is September 23, giving a typical growing season of about 128 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 17
- Average first fall frost
- Sep 23
- Growing season
- 128 days
Safer after Jun 1 (1-in-10 risk)
Possible by Sep 10 (1-in-10 risk)
Last frost typically in 202 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 14 · May 27 · Jun 10 | Aug 29 · Sep 14 · Sep 25 | 109 days | 100% |
| Frost / freeze (32°F) | May 5 · May 17 · Jun 1 | Sep 10 · Sep 23 · Oct 5 | 128 days | 100% |
| Hard freeze (28°F) | Apr 23 · May 7 · May 22 | Sep 19 · Oct 2 · Oct 15 | 147 days | 100% |
Planting calendar for Finley
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 16 – Jun 22 |
| Tomatoes | Transplant outdoors | Jun 2 – Jun 3 |
| Peppers | Start seeds indoors | Apr 16 – May 17 |
| Peppers | Transplant outdoors | Jun 16 – Jul 17 |
| Eggplant | Start seeds indoors | May 3 – Jun 1 |
| Eggplant | Transplant outdoors | Jun 16 – Jul 17 |
| Cucumbers | Sow outdoors | Jun 16 – Jun 13 |
| Summer squash | Sow outdoors | Jun 2 – Jul 17 |
| Winter squash & pumpkins | Sow outdoors | Jun 16 – Jul 17 |
| Snap beans | Sow outdoors | Jun 2 – Jul 6 |
| Sweet corn | Sow outdoors | Jun 2 – Jun 3 |
| Watermelon & cantaloupe | Sow outdoors | Jun 16 – Jul 17 |
| Okra | Sow outdoors | Jun 9 – Jul 2 |
| Peas | Sow outdoors (spring) | Apr 16 – Jun 1 |
| Potatoes | Plant outdoors (spring) | Apr 16 – Jun 16 |
| Onions | Start seeds indoors (spring) | Mar 5 – Apr 1 |
| Onions | Transplant outdoors (spring) | May 3 – Jun 1 |
| Broccoli | Start seeds indoors (spring) | Mar 29 – May 2 |
| Broccoli | Transplant outdoors (spring) | May 3 – Jun 1 |
| Broccoli | Start seeds indoors (fall) | May 24 – Jun 3 |
| Broccoli | Transplant outdoors (fall) | Jun 23 – Jul 4 |
| Cabbage | Start seeds indoors (spring) | Mar 19 – Apr 16 |
| Cabbage | Transplant outdoors (spring) | Apr 16 – May 17 |
| Cabbage | Start seeds indoors (fall) | May 14 – Jun 13 |
| Cabbage | Transplant outdoors (fall) | Jun 13 – Jul 14 |
| Leaf lettuce | Sow outdoors (spring) | Apr 16 – Jul 2 |
| Leaf lettuce | Sow outdoors (fall) | Jun 13 – Jul 30 |
| Spinach | Sow outdoors (spring) | Apr 9 – May 23 |
| Spinach | Sow outdoors (fall) | Jun 30 – Aug 4 |
| Radishes | Sow outdoors (spring) | Apr 16 – Jun 6 |
| Radishes | Sow outdoors (fall) | Jun 13 – Aug 14 |
| Kale | Sow outdoors (spring) | May 3 – May 23 |
| Kale | Sow outdoors (fall) | Jun 6 – Jul 14 |
| Carrots | Sow outdoors (spring) | May 17 – Jul 2 |
| Carrots | Sow outdoors (fall) | May 14 – Jun 29 |
| Garlic | Plant outdoors (fall) | Sep 13 – Oct 14 |
Where these dates come from
ZIP code 58230 is matched to the NOAA station Cooperstown, ND, 26.1 km away, at 1,380 ft elevation (104 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Cooperstown, ND (used) | 1,380 ft | May 17 | Sep 23 |
| Mayville, ND | 983 ft | May 13 | Sep 27 |
| Colgate, ND | 1,180 ft | May 10 | Sep 24 |
| Larimore 4Sw, ND | 1,152 ft | May 11 | Sep 28 |
Frost dates near Finley
- Sharon, ND 58277 · last May 17, first Sep 23
- Hope, ND 58046 · last May 10, first Sep 24
- Aneta, ND 58212 · last May 17, first Sep 23
- Hatton, ND 58240 · last May 13, first Sep 27
- Portland, ND 58274 · last May 13, first Sep 27
- Northwood, ND 58267 · last May 11, first Sep 28
- Clifford, ND 58016 · last May 13, first Sep 27
- Cooperstown, ND 58425 · last May 17, first Sep 23
Frequently asked questions
- When is the last frost in Finley, ND?
- For ZIP code 58230, the average last spring frost (32°F) is May 17, based on NOAA 1991-2020 climate normals for the Cooperstown, ND weather station. There is a 1-in-10 chance of a frost after June 1.
- When is the first frost in Finley, ND?
- The average first fall frost (32°F) is September 23. 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 58230?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 128 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.