Frost dates for 59027Emigrant, MT
The average last spring frost in Emigrant is May 21 and the average first fall frost is September 27, giving a typical growing season of about 128 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 21
- Average first fall frost
- Sep 27
- Growing season
- 128 days
Safer after Jun 9 (1-in-10 risk)
Possible by Sep 12 (1-in-10 risk)
Last frost typically in 200 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 20 · Jun 6 · Jun 22 | Sep 2 · Sep 16 · Sep 30 | 101 days | 100% |
| Frost / freeze (32°F) | May 5 · May 21 · Jun 9 | Sep 12 · Sep 27 · Oct 11 | 128 days | 100% |
| Hard freeze (28°F) | Apr 20 · May 6 · May 23 | Sep 25 · Oct 7 · Oct 23 | 153 days | 100% |
Planting calendar for Emigrant
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 – Jun 7 |
| 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 17 |
| Summer squash | Sow outdoors | Jun 6 – Jul 21 |
| Winter squash & pumpkins | Sow outdoors | Jun 20 – Jul 21 |
| Snap beans | Sow outdoors | Jun 6 – Jul 10 |
| Sweet corn | Sow outdoors | Jun 6 – Jun 7 |
| 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 28 – Jun 7 |
| Broccoli | Transplant outdoors (fall) | Jun 27 – Jul 8 |
| Cabbage | Start seeds indoors (spring) | Mar 23 – Apr 20 |
| Cabbage | Transplant outdoors (spring) | Apr 20 – May 21 |
| Cabbage | Start seeds indoors (fall) | May 18 – Jun 17 |
| Cabbage | Transplant outdoors (fall) | Jun 17 – Jul 18 |
| Leaf lettuce | Sow outdoors (spring) | Apr 20 – Jul 6 |
| Leaf lettuce | Sow outdoors (fall) | Jun 17 – Aug 3 |
| Spinach | Sow outdoors (spring) | Apr 13 – May 27 |
| Spinach | Sow outdoors (fall) | Jul 4 – Aug 8 |
| Radishes | Sow outdoors (spring) | Apr 20 – Jun 10 |
| Radishes | Sow outdoors (fall) | Jun 17 – Aug 18 |
| Kale | Sow outdoors (spring) | May 7 – May 27 |
| Kale | Sow outdoors (fall) | Jun 10 – Jul 18 |
| Carrots | Sow outdoors (spring) | May 21 – Jul 6 |
| Carrots | Sow outdoors (fall) | May 18 – Jul 3 |
| Garlic | Plant outdoors (fall) | Sep 17 – Oct 18 |
Where these dates come from
ZIP code 59027 is matched to the NOAA station Gardiner, MT, 27.5 km away, at 5,275 ft elevation (106 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Gardiner, MT (used) | 5,275 ft | May 21 | Sep 27 |
| Livingston 12 S, MT | 5,044 ft | May 19 | Sep 25 |
| Yellowstone Park Mammoth, WY | 6,195 ft | Jun 3 | Sep 14 |
| Big Sky 2Wnw, MT | 6,590 ft | — | — |
Frost dates near Emigrant
- Pray, MT 59065 · last May 19, first Sep 25
- Gardiner, MT 59030 · last —, first —
- Gallatin Gateway, MT 59730 · last —, first —
- Bozeman, MT 59717 · last —, first —
- Big Sky, MT 59716 · last —, first —
- Livingston, MT 59047 · last May 27, first Sep 14
- Yellowstone National Park, WY 82190 · last —, first —
- Belgrade, MT 59714 · last May 26, first Sep 16
Frequently asked questions
- When is the last frost in Emigrant, MT?
- For ZIP code 59027, the average last spring frost (32°F) is May 21, based on NOAA 1991-2020 climate normals for the Gardiner, MT weather station. There is a 1-in-10 chance of a frost after June 9.
- When is the first frost in Emigrant, MT?
- The average first fall frost (32°F) is September 27. There is a 1-in-10 chance of frost by September 12, so tender plants are at risk from that point on.
- How long is the growing season in 59027?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 128 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.