Frost dates for 59424Coffee Creek, MT
The average last spring frost in Coffee Creek is June 1 and the average first fall frost is September 11, giving a typical growing season of about 101 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 1
- Average first fall frost
- Sep 11
- Growing season
- 101 days
Safer after Jun 26 (1-in-10 risk)
Possible by Aug 29 (1-in-10 risk)
Last frost typically in 217 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) | — | — | 67 days | 100% |
| Frost / freeze (32°F) | May 15 · Jun 1 · Jun 26 | Aug 29 · Sep 11 · Sep 25 | 101 days | 100% |
| Hard freeze (28°F) | May 2 · May 14 · May 31 | Sep 10 · Sep 23 · Oct 5 | 128 days | 100% |
Planting calendar for Coffee 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 | May 1 – Jul 7 |
| Tomatoes | Transplant outdoors | Jun 17 – May 22 |
| Peppers | Start seeds indoors | May 1 – Jun 1 |
| Peppers | Transplant outdoors | Jul 1 – Aug 1 |
| Eggplant | Start seeds indoors | May 18 – Jun 16 |
| Eggplant | Transplant outdoors | Jul 1 – Aug 1 |
| Cucumbers | Sow outdoors | Jul 1 – Jun 1 |
| Summer squash | Sow outdoors | Jun 17 – Aug 1 |
| Winter squash & pumpkins | Sow outdoors | Jul 1 – Aug 1 |
| Snap beans | Sow outdoors | Jun 17 – Jun 24 |
| Sweet corn | Sow outdoors | Jun 17 – May 22 |
| Watermelon & cantaloupe | Sow outdoors | Jul 1 – Aug 1 |
| Okra | Sow outdoors | Jun 24 – Jul 17 |
| Peas | Sow outdoors (spring) | May 1 – Jun 16 |
| Potatoes | Plant outdoors (spring) | May 1 – Jul 1 |
| Onions | Start seeds indoors (spring) | Mar 20 – Apr 16 |
| Onions | Transplant outdoors (spring) | May 18 – Jun 16 |
| Broccoli | Start seeds indoors (spring) | Apr 13 – May 17 |
| Broccoli | Transplant outdoors (spring) | May 18 – Jun 16 |
| Broccoli | Start seeds indoors (fall) | May 12 – May 22 |
| Broccoli | Transplant outdoors (fall) | Jun 11 – Jun 22 |
| Cabbage | Start seeds indoors (spring) | Apr 3 – May 1 |
| Cabbage | Transplant outdoors (spring) | May 1 – Jun 1 |
| Cabbage | Start seeds indoors (fall) | May 2 – Jun 1 |
| Cabbage | Transplant outdoors (fall) | Jun 1 – Jul 2 |
| Leaf lettuce | Sow outdoors (spring) | May 1 – Jul 17 |
| Leaf lettuce | Sow outdoors (fall) | Jun 1 – Jul 18 |
| Spinach | Sow outdoors (spring) | Apr 24 – Jun 7 |
| Spinach | Sow outdoors (fall) | Jun 18 – Jul 23 |
| Radishes | Sow outdoors (spring) | May 1 – Jun 21 |
| Radishes | Sow outdoors (fall) | Jun 1 – Aug 2 |
| Kale | Sow outdoors (spring) | May 18 – Jun 7 |
| Kale | Sow outdoors (fall) | May 25 – Jul 2 |
| Carrots | Sow outdoors (spring) | Jun 1 – Jul 17 |
| Carrots | Sow outdoors (fall) | May 2 – Jun 17 |
| Garlic | Plant outdoors (fall) | Sep 1 – Oct 2 |
Where these dates come from
ZIP code 59424 is matched to the NOAA station Denton, MT, 12 km away, at 3,610 ft elevation (9 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Denton, MT (used) | 3,610 ft | Jun 1 | Sep 11 |
| Stanford, MT | 4,860 ft | May 25 | Sep 21 |
| Geraldine, MT | 3,145 ft | May 14 | Sep 26 |
| Moccasin Exp Stn, MT | 4,300 ft | May 28 | Sep 20 |
Frost dates near Coffee Creek
- Denton, MT 59430 · last Jun 1, first Sep 11
- Stanford, MT 59479 · last May 28, first Sep 20
- Geyser, MT 59447 · last May 22, first Sep 23
- Geraldine, MT 59446 · last May 14, first Sep 26
- Moccasin, MT 59462 · last May 28, first Sep 20
- Hobson, MT 59452 · last May 28, first Sep 20
- Raynesford, MT 59469 · last May 22, first Sep 23
- Moore, MT 59464 · last May 23, first Sep 21
Frequently asked questions
- When is the last frost in Coffee Creek, MT?
- For ZIP code 59424, the average last spring frost (32°F) is June 1, based on NOAA 1991-2020 climate normals for the Denton, MT weather station. There is a 1-in-10 chance of a frost after June 26.
- When is the first frost in Coffee Creek, MT?
- The average first fall frost (32°F) is September 11. There is a 1-in-10 chance of frost by August 29, so tender plants are at risk from that point on.
- How long is the growing season in 59424?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 101 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.