Frost dates for 59875Victor, MT
The average last spring frost in Victor is May 23 and the average first fall frost is September 21, giving a typical growing season of about 118 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 23
- Average first fall frost
- Sep 21
- Growing season
- 118 days
Safer after Jun 10 (1-in-10 risk)
Possible by Sep 5 (1-in-10 risk)
Last frost typically in 208 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 27 · Jun 12 · Jul 1 | Aug 24 · Sep 8 · Sep 22 | 84 days | 100% |
| Frost / freeze (32°F) | May 8 · May 23 · Jun 10 | Sep 5 · Sep 21 · Oct 4 | 118 days | 100% |
| Hard freeze (28°F) | Apr 22 · May 5 · May 19 | Sep 16 · Oct 2 · Oct 16 | 148 days | 100% |
Planting calendar for Victor
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 22 – Jun 28 |
| Tomatoes | Transplant outdoors | Jun 8 – Jun 1 |
| Peppers | Start seeds indoors | Apr 22 – May 23 |
| Peppers | Transplant outdoors | Jun 22 – Jul 23 |
| Eggplant | Start seeds indoors | May 9 – Jun 7 |
| Eggplant | Transplant outdoors | Jun 22 – Jul 23 |
| Cucumbers | Sow outdoors | Jun 22 – Jun 11 |
| Summer squash | Sow outdoors | Jun 8 – Jul 23 |
| Winter squash & pumpkins | Sow outdoors | Jun 22 – Jul 23 |
| Snap beans | Sow outdoors | Jun 8 – Jul 4 |
| Sweet corn | Sow outdoors | Jun 8 – Jun 1 |
| Watermelon & cantaloupe | Sow outdoors | Jun 22 – Jul 23 |
| Okra | Sow outdoors | Jun 15 – Jul 8 |
| Peas | Sow outdoors (spring) | Apr 22 – Jun 7 |
| Potatoes | Plant outdoors (spring) | Apr 22 – Jun 22 |
| Onions | Start seeds indoors (spring) | Mar 11 – Apr 7 |
| Onions | Transplant outdoors (spring) | May 9 – Jun 7 |
| Broccoli | Start seeds indoors (spring) | Apr 4 – May 8 |
| Broccoli | Transplant outdoors (spring) | May 9 – Jun 7 |
| Broccoli | Start seeds indoors (fall) | May 22 – Jun 1 |
| Broccoli | Transplant outdoors (fall) | Jun 21 – Jul 2 |
| Cabbage | Start seeds indoors (spring) | Mar 25 – Apr 22 |
| Cabbage | Transplant outdoors (spring) | Apr 22 – May 23 |
| Cabbage | Start seeds indoors (fall) | May 12 – Jun 11 |
| Cabbage | Transplant outdoors (fall) | Jun 11 – Jul 12 |
| Leaf lettuce | Sow outdoors (spring) | Apr 22 – Jul 8 |
| Leaf lettuce | Sow outdoors (fall) | Jun 11 – Jul 28 |
| Spinach | Sow outdoors (spring) | Apr 15 – May 29 |
| Spinach | Sow outdoors (fall) | Jun 28 – Aug 2 |
| Radishes | Sow outdoors (spring) | Apr 22 – Jun 12 |
| Radishes | Sow outdoors (fall) | Jun 11 – Aug 12 |
| Kale | Sow outdoors (spring) | May 9 – May 29 |
| Kale | Sow outdoors (fall) | Jun 4 – Jul 12 |
| Carrots | Sow outdoors (spring) | May 23 – Jul 8 |
| Carrots | Sow outdoors (fall) | May 12 – Jun 27 |
| Garlic | Plant outdoors (fall) | Sep 11 – Oct 12 |
Where these dates come from
ZIP code 59875 is matched to the NOAA station Western Ag Rsch Ctr, MT, 10.2 km away, at 3,608 ft elevation (71 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Western Ag Rsch Ctr, MT (used) | 3,608 ft | May 23 | Sep 21 |
| Stevensville, MT | 3,375 ft | May 22 | Sep 19 |
| Hamilton, MT | 3,585 ft | May 21 | Sep 22 |
| Darby, MT | 3,880 ft | May 24 | Sep 23 |
Frost dates near Victor
- Pinesdale, MT 59841 · last May 23, first Sep 21
- Corvallis, MT 59828 · last May 23, first Sep 21
- Stevensville, MT 59870 · last May 22, first Sep 19
- Hamilton, MT 59840 · last May 21, first Sep 22
- Grantsdale, MT 59835 · last May 21, first Sep 22
- Florence, MT 59833 · last May 22, first Sep 19
- Lolo, MT 59847 · last May 16, first Sep 26
- Darby, MT 59829 · last May 24, first Sep 23
Frequently asked questions
- When is the last frost in Victor, MT?
- For ZIP code 59875, the average last spring frost (32°F) is May 23, based on NOAA 1991-2020 climate normals for the Western Ag Rsch Ctr, MT weather station. There is a 1-in-10 chance of a frost after June 10.
- When is the first frost in Victor, MT?
- The average first fall frost (32°F) is September 21. 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 59875?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 118 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.