The last 36°F Spring frost date is 30% likely to be on May 27. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on May 13. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Ballantine, MT are based on historical climate data.
Always check your local forecast for the most up-to-date frost warnings.
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The last spring frost signals when your area is safe from freezing temperatures. Tender plants can now grow outdoors without cold damage! This marks the beginning of the growing season. Last spring frost serves as your essential starting point for planting warm-season crops. It's also time to remove winter protection from your perennials. Enjoy the longer days and warmer weather!
Start seeds indoors several weeks before your last frost date. This gives plants time to reach transplanting size when weather permits. Plan your outdoor planting schedule around your area's average last frost date. Plant some crops before and some after this date to protect against weather changes. Look for spots in your yard where frost stays longer or disappears earlier. Create your own frost map to use all available growing space and extend your season. Keep watching your local weather forecast to catch any surprise late frosts.
| Probability of frost (36°F) on or after… | |
|---|---|
| 10% chance | Jun 5 |
| 20% chance | May 31 |
| 30% chance | May 27 |
| 40% chance | May 23 |
| 50% chance | May 20 |
| 60% chance | May 18 |
| 70% chance | May 15 |
| 80% chance | May 12 |
| 90% chance | May 7 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 22 |
| 20% chance | May 17 |
| 30% chance | May 13 |
| 40% chance | May 10 |
| 50% chance | May 8 |
| 60% chance | May 5 |
| 70% chance | May 3 |
| 80% chance | Apr 30 |
| 90% chance | Apr 27 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | May 10 |
| 20% chance | May 6 |
| 30% chance | May 3 |
| 40% chance | Apr 30 |
| 50% chance | Apr 28 |
| 60% chance | Apr 25 |
| 70% chance | Apr 22 |
| 80% chance | Apr 19 |
| 90% chance | Apr 14 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | May 1 |
| 20% chance | Apr 26 |
| 30% chance | Apr 23 |
| 40% chance | Apr 20 |
| 50% chance | Apr 16 |
| 60% chance | Apr 13 |
| 70% chance | Apr 9 |
| 80% chance | Apr 6 |
| 90% chance | Apr 2 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Apr 21 |
| 20% chance | Apr 16 |
| 30% chance | Apr 12 |
| 40% chance | Apr 8 |
| 50% chance | Apr 5 |
| 60% chance | Apr 3 |
| 70% chance | Mar 31 |
| 80% chance | Mar 27 |
| 90% chance | Mar 21 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Apr 13 |
| 20% chance | Apr 6 |
| 30% chance | Apr 2 |
| 40% chance | Mar 31 |
| 50% chance | Mar 28 |
| 60% chance | Mar 24 |
| 70% chance | Mar 20 |
| 80% chance | Mar 15 |
| 90% chance | Mar 7 |
Agricultural climatic data from weather station: BALLANTINE (USC00240432)