Frost dates for 59537Loring, MT
The average last spring frost in Loring is May 19 and the average first fall frost is September 22, giving a typical growing season of about 124 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 19
- Average first fall frost
- Sep 22
- Growing season
- 124 days
Safer after Jun 2 (1-in-10 risk)
Possible by Sep 9 (1-in-10 risk)
Last frost typically in 204 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 · May 31 · Jun 15 | Aug 30 · Sep 12 · Sep 24 | 103 days | 100% |
| Frost / freeze (32°F) | May 5 · May 19 · Jun 2 | Sep 9 · Sep 22 · Oct 4 | 124 days | 100% |
| Hard freeze (28°F) | Apr 23 · May 8 · May 21 | Sep 15 · Sep 30 · Oct 12 | 144 days | 100% |
Planting calendar for Loring
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 18 – Jun 24 |
| Tomatoes | Transplant outdoors | Jun 4 – Jun 2 |
| Peppers | Start seeds indoors | Apr 18 – May 19 |
| Peppers | Transplant outdoors | Jun 18 – Jul 19 |
| Eggplant | Start seeds indoors | May 5 – Jun 3 |
| Eggplant | Transplant outdoors | Jun 18 – Jul 19 |
| Cucumbers | Sow outdoors | Jun 18 – Jun 12 |
| Summer squash | Sow outdoors | Jun 4 – Jul 19 |
| Winter squash & pumpkins | Sow outdoors | Jun 18 – Jul 19 |
| Snap beans | Sow outdoors | Jun 4 – Jul 5 |
| Sweet corn | Sow outdoors | Jun 4 – Jun 2 |
| Watermelon & cantaloupe | Sow outdoors | Jun 18 – Jul 19 |
| Okra | Sow outdoors | Jun 11 – Jul 4 |
| Peas | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Potatoes | Plant outdoors (spring) | Apr 18 – Jun 18 |
| Onions | Start seeds indoors (spring) | Mar 7 – Apr 3 |
| Onions | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (spring) | Mar 31 – May 4 |
| Broccoli | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (fall) | May 23 – Jun 2 |
| Broccoli | Transplant outdoors (fall) | Jun 22 – Jul 3 |
| Cabbage | Start seeds indoors (spring) | Mar 21 – Apr 18 |
| Cabbage | Transplant outdoors (spring) | Apr 18 – May 19 |
| Cabbage | Start seeds indoors (fall) | May 13 – Jun 12 |
| Cabbage | Transplant outdoors (fall) | Jun 12 – Jul 13 |
| Leaf lettuce | Sow outdoors (spring) | Apr 18 – Jul 4 |
| Leaf lettuce | Sow outdoors (fall) | Jun 12 – Jul 29 |
| Spinach | Sow outdoors (spring) | Apr 11 – May 25 |
| Spinach | Sow outdoors (fall) | Jun 29 – Aug 3 |
| Radishes | Sow outdoors (spring) | Apr 18 – Jun 8 |
| Radishes | Sow outdoors (fall) | Jun 12 – Aug 13 |
| Kale | Sow outdoors (spring) | May 5 – May 25 |
| Kale | Sow outdoors (fall) | Jun 5 – Jul 13 |
| Carrots | Sow outdoors (spring) | May 19 – Jul 4 |
| Carrots | Sow outdoors (fall) | May 13 – Jun 28 |
| Garlic | Plant outdoors (fall) | Sep 12 – Oct 13 |
Where these dates come from
ZIP code 59537 is matched to the NOAA station Port Of Morgan, MT, 22.3 km away, at 2,830 ft elevation (120 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Port Of Morgan, MT (used) | 2,830 ft | May 19 | Sep 22 |
| Turner 11N, MT | 2,982 ft | May 19 | Sep 21 |
| Malta 7 E, MT | 2,231 ft | May 7 | Sep 28 |
| Malta, MT | 2,262 ft | May 10 | Sep 29 |
Frost dates near Loring
- Whitewater, MT 59544 · last May 15, first Sep 23
- Saco, MT 59261 · last May 15, first Sep 23
- Turner, MT 59542 · last May 19, first Sep 21
- Malta, MT 59538 · last May 10, first Sep 29
- Dodson, MT 59524 · last May 10, first Sep 29
- Hogeland, MT 59529 · last May 19, first Sep 21
- Harlem, MT 59526 · last May 16, first Sep 21
- Hinsdale, MT 59241 · last May 15, first Sep 23
Frequently asked questions
- When is the last frost in Loring, MT?
- For ZIP code 59537, the average last spring frost (32°F) is May 19, based on NOAA 1991-2020 climate normals for the Port Of Morgan, MT weather station. There is a 1-in-10 chance of a frost after June 2.
- When is the first frost in Loring, MT?
- The average first fall frost (32°F) is September 22. There is a 1-in-10 chance of frost by September 9, so tender plants are at risk from that point on.
- How long is the growing season in 59537?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 124 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.