Frost dates for 59648Wolf Creek, MT
The average last spring frost in Wolf Creek is May 21 and the average first fall frost is September 15, giving a typical growing season of about 115 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 21
- Average first fall frost
- Sep 15
- Growing season
- 115 days
Safer after Jun 8 (1-in-10 risk)
Possible by Aug 30 (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) | — | — | 81 days | 100% |
| Frost / freeze (32°F) | May 7 · May 21 · Jun 8 | Aug 30 · Sep 15 · Sep 29 | 115 days | 100% |
| Hard freeze (28°F) | Apr 26 · May 7 · May 23 | Sep 13 · Sep 28 · Oct 13 | 143 days | 100% |
Planting calendar for Wolf Creek
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 26 |
| 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 5 |
| Summer squash | Sow outdoors | Jun 6 – Jul 21 |
| Winter squash & pumpkins | Sow outdoors | Jun 20 – Jul 21 |
| Snap beans | Sow outdoors | Jun 6 – Jun 28 |
| Sweet corn | Sow outdoors | Jun 6 – May 26 |
| 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 16 – May 26 |
| Broccoli | Transplant outdoors (fall) | Jun 15 – Jun 26 |
| Cabbage | Start seeds indoors (spring) | Mar 23 – Apr 20 |
| Cabbage | Transplant outdoors (spring) | Apr 20 – May 21 |
| Cabbage | Start seeds indoors (fall) | May 6 – Jun 5 |
| Cabbage | Transplant outdoors (fall) | Jun 5 – Jul 6 |
| Leaf lettuce | Sow outdoors (spring) | Apr 20 – Jul 6 |
| Leaf lettuce | Sow outdoors (fall) | Jun 5 – Jul 22 |
| Spinach | Sow outdoors (spring) | Apr 13 – May 27 |
| Spinach | Sow outdoors (fall) | Jun 22 – Jul 27 |
| Radishes | Sow outdoors (spring) | Apr 20 – Jun 10 |
| Radishes | Sow outdoors (fall) | Jun 5 – Aug 6 |
| Kale | Sow outdoors (spring) | May 7 – May 27 |
| Kale | Sow outdoors (fall) | May 29 – Jul 6 |
| Carrots | Sow outdoors (spring) | May 21 – Jul 6 |
| Carrots | Sow outdoors (fall) | May 6 – Jun 21 |
| Garlic | Plant outdoors (fall) | Sep 5 – Oct 6 |
Where these dates come from
ZIP code 59648 is matched to the NOAA station Rogers Pass 9 Nne, MT, 15.8 km away, at 4,200 ft elevation (7 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Rogers Pass 9 Nne, MT (used) | 4,200 ft | May 21 | Sep 15 |
| Holter Dam, MT | 3,487 ft | May 19 | Sep 24 |
| Cascade 5 S, MT | 3,360 ft | May 21 | Sep 19 |
| Adel, MT | 5,017 ft | Jun 4 | Sep 12 |
Frost dates near Wolf Creek
- Canyon Creek, MT 59633 · last Jun 4, first Sep 14
- Marysville, MT 59640 · last Jun 4, first Sep 14
- Cascade, MT 59421 · last May 21, first Sep 19
- Lincoln, MT 59639 · last —, first —
- Helena, MT 59602 · last May 9, first Sep 30
- Augusta, MT 59410 · last May 19, first Sep 21
- Simms, MT 59477 · last Jun 2, first Sep 10
- Ulm, MT 59485 · last Jun 2, first Sep 10
Frequently asked questions
- When is the last frost in Wolf Creek, MT?
- For ZIP code 59648, the average last spring frost (32°F) is May 21, based on NOAA 1991-2020 climate normals for the Rogers Pass 9 Nne, MT weather station. There is a 1-in-10 chance of a frost after June 8.
- When is the first frost in Wolf Creek, MT?
- The average first fall frost (32°F) is September 15. There is a 1-in-10 chance of frost by August 30, so tender plants are at risk from that point on.
- How long is the growing season in 59648?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 115 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.