Frost dates for 59465Neihart, MT
The average last spring frost in Neihart is June 6 and the average first fall frost is September 12, giving a typical growing season of about 99 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 6
- Average first fall frost
- Sep 12
- Growing season
- 99 days
Safer after Jun 28 (1-in-10 risk)
Possible by Aug 29 (1-in-10 risk)
Last frost typically in 222 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) | — | — | 61 days | 100% |
| Frost / freeze (32°F) | May 23 · Jun 6 · Jun 28 | Aug 29 · Sep 12 · Sep 27 | 99 days | 100% |
| Hard freeze (28°F) | May 6 · May 18 · May 31 | Sep 11 · Sep 26 · Oct 12 | 130 days | 100% |
Planting calendar for Neihart
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 6 – Jul 12 |
| Tomatoes | Transplant outdoors | Jun 22 – May 23 |
| Peppers | Start seeds indoors | May 6 – Jun 6 |
| Peppers | Transplant outdoors | Jul 6 – Aug 6 |
| Eggplant | Start seeds indoors | May 23 – Jun 21 |
| Eggplant | Transplant outdoors | Jul 6 – Aug 6 |
| Cucumbers | Sow outdoors | Jul 6 – Jun 2 |
| Summer squash | Sow outdoors | Jun 22 – Aug 6 |
| Winter squash & pumpkins | Sow outdoors | Jul 6 – Aug 6 |
| Snap beans | Sow outdoors | Jun 22 – Jun 25 |
| Sweet corn | Sow outdoors | Jun 22 – May 23 |
| Watermelon & cantaloupe | Sow outdoors | Jul 6 – Aug 6 |
| Okra | Sow outdoors | Jun 29 – Jul 22 |
| Peas | Sow outdoors (spring) | May 6 – Jun 21 |
| Potatoes | Plant outdoors (spring) | May 6 – Jul 6 |
| Onions | Start seeds indoors (spring) | Mar 25 – Apr 21 |
| Onions | Transplant outdoors (spring) | May 23 – Jun 21 |
| Broccoli | Start seeds indoors (spring) | Apr 18 – May 22 |
| Broccoli | Transplant outdoors (spring) | May 23 – Jun 21 |
| Broccoli | Start seeds indoors (fall) | May 13 – May 23 |
| Broccoli | Transplant outdoors (fall) | Jun 12 – Jun 23 |
| Cabbage | Start seeds indoors (spring) | Apr 8 – May 6 |
| Cabbage | Transplant outdoors (spring) | May 6 – Jun 6 |
| Cabbage | Start seeds indoors (fall) | May 3 – Jun 2 |
| Cabbage | Transplant outdoors (fall) | Jun 2 – Jul 3 |
| Leaf lettuce | Sow outdoors (spring) | May 6 – Jul 22 |
| Leaf lettuce | Sow outdoors (fall) | Jun 2 – Jul 19 |
| Spinach | Sow outdoors (spring) | Apr 29 – Jun 12 |
| Spinach | Sow outdoors (fall) | Jun 19 – Jul 24 |
| Radishes | Sow outdoors (spring) | May 6 – Jun 26 |
| Radishes | Sow outdoors (fall) | Jun 2 – Aug 3 |
| Kale | Sow outdoors (spring) | May 23 – Jun 12 |
| Kale | Sow outdoors (fall) | May 26 – Jul 3 |
| Carrots | Sow outdoors (spring) | Jun 6 – Jul 22 |
| Carrots | Sow outdoors (fall) | May 3 – Jun 18 |
| Garlic | Plant outdoors (fall) | Sep 2 – Oct 3 |
Where these dates come from
ZIP code 59465 is matched to the NOAA station Neihart 8 Nnw, MT, 11.8 km away, at 5,230 ft elevation (718 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Neihart 8 Nnw, MT (used) | 5,230 ft | Jun 6 | Sep 12 |
| Millegan 14 Se, MT | 4,970 ft | Jun 11 | Sep 6 |
| Lewistown 42 Wsw, MT | 5,070 ft | Jun 15 | Sep 4 |
| Raynesford 2 Nnw, MT | 4,215 ft | May 22 | Sep 23 |
Frost dates near Neihart
- Monarch, MT 59463 · last Jun 6, first Sep 12
- Raynesford, MT 59469 · last May 22, first Sep 23
- Geyser, MT 59447 · last May 22, first Sep 23
- White Sulphur Springs, MT 59645 · last Jun 4, first Sep 11
- Stanford, MT 59479 · last May 28, first Sep 20
- Belt, MT 59412 · last May 22, first Sep 23
- Stockett, MT 59480 · last May 22, first Sep 23
- Martinsdale, MT 59053 · last —, first —
Frequently asked questions
- When is the last frost in Neihart, MT?
- For ZIP code 59465, the average last spring frost (32°F) is June 6, based on NOAA 1991-2020 climate normals for the Neihart 8 Nnw, MT weather station. There is a 1-in-10 chance of a frost after June 28.
- When is the first frost in Neihart, MT?
- The average first fall frost (32°F) is September 12. 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 59465?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 99 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.