Frost dates for 59344Plevna, MT
The average last spring frost in Plevna is May 21 and the average first fall frost is September 20, giving a typical growing season of about 121 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 21
- Average first fall frost
- Sep 20
- Growing season
- 121 days
Safer after Jun 4 (1-in-10 risk)
Possible by Sep 5 (1-in-10 risk)
Last frost typically in 206 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 · Jun 1 · Jun 18 | Aug 27 · Sep 10 · Sep 24 | 99 days | 100% |
| Frost / freeze (32°F) | May 9 · May 21 · Jun 4 | Sep 5 · Sep 20 · Oct 5 | 121 days | 100% |
| Hard freeze (28°F) | Apr 29 · May 11 · May 25 | Sep 13 · Sep 30 · Oct 14 | 141 days | 100% |
Planting calendar for Plevna
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 20 – Jun 26 |
| Tomatoes | Transplant outdoors | Jun 6 – May 31 |
| Peppers | Start seeds indoors | Apr 20 – May 21 |
| Peppers | Transplant outdoors | Jun 20 – Jul 21 |
| Eggplant | Start seeds indoors | May 7 – Jun 5 |
| Eggplant | Transplant outdoors | Jun 20 – Jul 21 |
| Cucumbers | Sow outdoors | Jun 20 – Jun 10 |
| Summer squash | Sow outdoors | Jun 6 – Jul 21 |
| Winter squash & pumpkins | Sow outdoors | Jun 20 – Jul 21 |
| Snap beans | Sow outdoors | Jun 6 – Jul 3 |
| Sweet corn | Sow outdoors | Jun 6 – May 31 |
| Watermelon & cantaloupe | Sow outdoors | Jun 20 – Jul 21 |
| Okra | Sow outdoors | Jun 13 – Jul 6 |
| Peas | Sow outdoors (spring) | Apr 20 – Jun 5 |
| Potatoes | Plant outdoors (spring) | Apr 20 – Jun 20 |
| Onions | Start seeds indoors (spring) | Mar 9 – Apr 5 |
| Onions | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (spring) | Apr 2 – May 6 |
| Broccoli | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (fall) | May 21 – May 31 |
| Broccoli | Transplant outdoors (fall) | Jun 20 – Jul 1 |
| Cabbage | Start seeds indoors (spring) | Mar 23 – Apr 20 |
| Cabbage | Transplant outdoors (spring) | Apr 20 – May 21 |
| Cabbage | Start seeds indoors (fall) | May 11 – Jun 10 |
| Cabbage | Transplant outdoors (fall) | Jun 10 – Jul 11 |
| Leaf lettuce | Sow outdoors (spring) | Apr 20 – Jul 6 |
| Leaf lettuce | Sow outdoors (fall) | Jun 10 – Jul 27 |
| Spinach | Sow outdoors (spring) | Apr 13 – May 27 |
| Spinach | Sow outdoors (fall) | Jun 27 – Aug 1 |
| Radishes | Sow outdoors (spring) | Apr 20 – Jun 10 |
| Radishes | Sow outdoors (fall) | Jun 10 – Aug 11 |
| Kale | Sow outdoors (spring) | May 7 – May 27 |
| Kale | Sow outdoors (fall) | Jun 3 – Jul 11 |
| Carrots | Sow outdoors (spring) | May 21 – Jul 6 |
| Carrots | Sow outdoors (fall) | May 11 – Jun 26 |
| Garlic | Plant outdoors (fall) | Sep 10 – Oct 11 |
Where these dates come from
ZIP code 59344 is matched to the NOAA station Plevna, MT, 4.3 km away, at 2,780 ft elevation (44 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Plevna, MT (used) | 2,780 ft | May 21 | Sep 20 |
| Baker, MT | 2,933 ft | May 12 | Sep 26 |
| Baker Muni Ap, MT | 2,971 ft | May 16 | Sep 26 |
| Carlyle 13 Nw, MT | 3,145 ft | May 18 | Sep 29 |
Frost dates near Plevna
- Baker, MT 59313 · last May 16, first Sep 26
- Willard, MT 59354 · last May 16, first Sep 26
- Mildred, MT 59341 · last May 20, first Sep 22
- Ismay, MT 59336 · last May 22, first Sep 15
- Marmarth, ND 58643 · last May 16, first Sep 26
- Golva, ND 58632 · last May 16, first Sep 26
- Fallon, MT 59326 · last May 20, first Sep 22
- Ekalaka, MT 59324 · last May 20, first Sep 23
Frequently asked questions
- When is the last frost in Plevna, MT?
- For ZIP code 59344, the average last spring frost (32°F) is May 21, based on NOAA 1991-2020 climate normals for the Plevna, MT weather station. There is a 1-in-10 chance of a frost after June 4.
- When is the first frost in Plevna, MT?
- The average first fall frost (32°F) is September 20. There is a 1-in-10 chance of frost by September 5, so tender plants are at risk from that point on.
- How long is the growing season in 59344?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 121 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.