Frost dates for 59026Edgar, MT
The average last spring frost in Edgar is May 14 and the average first fall frost is September 24, giving a typical growing season of about 129 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 14
- Average first fall frost
- Sep 24
- Growing season
- 129 days
Safer after May 30 (1-in-10 risk)
Possible by Sep 7 (1-in-10 risk)
Last frost typically in 199 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 16 · Jun 1 · Jun 17 | Aug 31 · Sep 12 · Sep 25 | 103 days | 100% |
| Frost / freeze (32°F) | May 2 · May 14 · May 30 | Sep 7 · Sep 24 · Oct 7 | 129 days | 100% |
| Hard freeze (28°F) | Apr 19 · May 1 · May 13 | Sep 20 · Oct 4 · Oct 19 | 154 days | 100% |
Planting calendar for Edgar
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 13 – Jun 19 |
| Tomatoes | Transplant outdoors | May 30 – Jun 4 |
| Peppers | Start seeds indoors | Apr 13 – May 14 |
| Peppers | Transplant outdoors | Jun 13 – Jul 14 |
| Eggplant | Start seeds indoors | Apr 30 – May 29 |
| Eggplant | Transplant outdoors | Jun 13 – Jul 14 |
| Cucumbers | Sow outdoors | Jun 13 – Jun 14 |
| Summer squash | Sow outdoors | May 30 – Jul 14 |
| Winter squash & pumpkins | Sow outdoors | Jun 13 – Jul 14 |
| Snap beans | Sow outdoors | May 30 – Jul 7 |
| Sweet corn | Sow outdoors | May 30 – Jun 4 |
| Watermelon & cantaloupe | Sow outdoors | Jun 13 – Jul 14 |
| Okra | Sow outdoors | Jun 6 – Jun 29 |
| Peas | Sow outdoors (spring) | Apr 13 – May 29 |
| Potatoes | Plant outdoors (spring) | Apr 13 – Jun 13 |
| Onions | Start seeds indoors (spring) | Mar 2 – Mar 29 |
| Onions | Transplant outdoors (spring) | Apr 30 – May 29 |
| Broccoli | Start seeds indoors (spring) | Mar 26 – Apr 29 |
| Broccoli | Transplant outdoors (spring) | Apr 30 – May 29 |
| Broccoli | Start seeds indoors (fall) | May 25 – Jun 4 |
| Broccoli | Transplant outdoors (fall) | Jun 24 – Jul 5 |
| Cabbage | Start seeds indoors (spring) | Mar 16 – Apr 13 |
| Cabbage | Transplant outdoors (spring) | Apr 13 – May 14 |
| Cabbage | Start seeds indoors (fall) | May 15 – Jun 14 |
| Cabbage | Transplant outdoors (fall) | Jun 14 – Jul 15 |
| Leaf lettuce | Sow outdoors (spring) | Apr 13 – Jun 29 |
| Leaf lettuce | Sow outdoors (fall) | Jun 14 – Jul 31 |
| Spinach | Sow outdoors (spring) | Apr 6 – May 20 |
| Spinach | Sow outdoors (fall) | Jul 1 – Aug 5 |
| Radishes | Sow outdoors (spring) | Apr 13 – Jun 3 |
| Radishes | Sow outdoors (fall) | Jun 14 – Aug 15 |
| Kale | Sow outdoors (spring) | Apr 30 – May 20 |
| Kale | Sow outdoors (fall) | Jun 7 – Jul 15 |
| Carrots | Sow outdoors (spring) | May 14 – Jun 29 |
| Carrots | Sow outdoors (fall) | May 15 – Jun 30 |
| Garlic | Plant outdoors (fall) | Sep 14 – Oct 15 |
Where these dates come from
ZIP code 59026 is matched to the NOAA station Bridger 2 N, MT, 16 km away, at 3,583 ft elevation (118 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Bridger 2 N, MT (used) | 3,583 ft | May 14 | Sep 24 |
| Joliet, MT | 3,838 ft | May 29 | Sep 15 |
| Columbus, MT | 3,602 ft | May 27 | Sep 14 |
| Billings Wfo, MT | 3,185 ft | May 5 | Oct 3 |
Frost dates near Edgar
- Fromberg, MT 59029 · last May 14, first Sep 24
- Joliet, MT 59041 · last May 29, first Sep 15
- Boyd, MT 59013 · last May 29, first Sep 15
- Park City, MT 59063 · last May 27, first Sep 14
- Bridger, MT 59014 · last May 14, first Sep 24
- Laurel, MT 59044 · last May 5, first Oct 3
- Pryor, MT 59066 · last May 29, first Sep 15
- Roberts, MT 59070 · last May 29, first Sep 15
Frequently asked questions
- When is the last frost in Edgar, MT?
- For ZIP code 59026, the average last spring frost (32°F) is May 14, based on NOAA 1991-2020 climate normals for the Bridger 2 N, MT weather station. There is a 1-in-10 chance of a frost after May 30.
- When is the first frost in Edgar, MT?
- The average first fall frost (32°F) is September 24. There is a 1-in-10 chance of frost by September 7, so tender plants are at risk from that point on.
- How long is the growing season in 59026?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 129 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.