A 36°F frost is always a risk here. (See detailed probabilities below.)
A 32°F light freeze is always a risk here. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Twin Bridges, 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 | always |
| 20% chance | always |
| 30% chance | always |
| 40% chance | always |
| 50% chance | always |
| 60% chance | always |
| 70% chance | always |
| 80% chance | always |
| 90% chance | always |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | always |
| 20% chance | always |
| 30% chance | always |
| 40% chance | always |
| 50% chance | always |
| 60% chance | always |
| 70% chance | always |
| 80% chance | always |
| 90% chance | always |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | Jun 9 |
| 20% chance | Jun 2 |
| 30% chance | May 30 |
| 40% chance | May 26 |
| 50% chance | May 23 |
| 60% chance | May 19 |
| 70% chance | May 16 |
| 80% chance | May 13 |
| 90% chance | May 8 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | May 23 |
| 20% chance | May 18 |
| 30% chance | May 15 |
| 40% chance | May 12 |
| 50% chance | May 9 |
| 60% chance | May 6 |
| 70% chance | May 4 |
| 80% chance | May 1 |
| 90% chance | Apr 26 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | May 12 |
| 20% chance | May 7 |
| 30% chance | May 4 |
| 40% chance | May 1 |
| 50% chance | Apr 28 |
| 60% chance | Apr 25 |
| 70% chance | Apr 21 |
| 80% chance | Apr 17 |
| 90% chance | Apr 11 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | May 1 |
| 20% chance | Apr 26 |
| 30% chance | Apr 21 |
| 40% chance | Apr 16 |
| 50% chance | Apr 12 |
| 60% chance | Apr 8 |
| 70% chance | Apr 4 |
| 80% chance | Mar 31 |
| 90% chance | Mar 24 |
Agricultural climatic data from weather station: TWIN BRIDGES (USC00248430)