🌷 2026 Last Frost Dates for Cooke City, Montana 59020
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 Cooke City, MT are based on historical climate data.
Always check your local forecast for the most up-to-date frost warnings.
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What is a Last Frost Date?
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!
How to use the Last Frost Date?
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.
Last Frost Date Probabilities
| 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 | 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 hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Jun 23 |
| 20% chance | Jun 16 |
| 30% chance | Jun 11 |
| 40% chance | Jun 6 |
| 50% chance | Jun 3 |
| 60% chance | May 31 |
| 70% chance | May 26 |
| 80% chance | May 21 |
| 90% chance | May 15 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | May 29 |
| 20% chance | May 24 |
| 30% chance | May 20 |
| 40% chance | May 16 |
| 50% chance | May 13 |
| 60% chance | May 10 |
| 70% chance | May 7 |
| 80% chance | May 4 |
| 90% chance | Apr 30 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | May 13 |
| 20% chance | May 7 |
| 30% chance | May 4 |
| 40% chance | May 1 |
| 50% chance | Apr 30 |
| 60% chance | Apr 27 |
| 70% chance | Apr 23 |
| 80% chance | Apr 19 |
| 90% chance | Apr 15 |
Agricultural climatic data from weather station: SILVER GATE (USC00247603:frost)