🌷 Your Ultimate Garden Calendar!

🌷 Last Frost Dates for Greycliff, Montana 59033

The last 36°F Spring frost date is 30% likely to be on Jun 1. (See detailed probabilities below.)

The last 32°F light freeze date is 30% likely to be on May 19. (See detailed probabilities below.)

(See also 🍂 First Fall Frost Dates.)

Last frost date probabilities for Greycliff, MT are based on historical climate data.

Always check your local forecast for the most up-to-date frost warnings.

Book Recommendations (ads!)

📚 Growing Under Cover: Techniques for a More Productive, Weather-Resistant, Pest-Free Vegetable Garden

📚 Greenhouse Gardening for Beginners: Step By Step Guide To Build A Year-Round Greenhouse And Grow Herbs, Organic Fruits And Vegetables, Plants, Flowers Plans & Ideas for Extending the Growing Season

📚 How to Garden Indoors & Grow Your Own Food Year Round: Ultimate Guide to Vertical, Container, and Hydroponic Gardening (Creative Homeowner) Vegetables, Herbs, DIY Projects, Composting, Lights, & More

📚 The Year-Round Vegetable Gardener: How to Grow Your Own Food 365 Days a Year, No Matter Where You Live

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% chanceJun 11
20% chanceJun 5
30% chanceJun 1
40% chanceMay 29
50% chanceMay 27
60% chanceMay 24
70% chanceMay 21
80% chanceMay 18
90% chanceMay 14
Probability of light freeze (32°F) on or after…
10% chanceMay 27
20% chanceMay 22
30% chanceMay 19
40% chanceMay 17
50% chanceMay 14
60% chanceMay 11
70% chanceMay 8
80% chanceMay 5
90% chanceApr 30
Probability of moderate freeze (28°F) on or after…
10% chanceMay 15
20% chanceMay 11
30% chanceMay 7
40% chanceMay 4
50% chanceMay 2
60% chanceApr 30
70% chanceApr 26
80% chanceApr 23
90% chanceApr 18
Probability of moderate hard freeze (24°F) on or after…
10% chanceMay 4
20% chanceApr 30
30% chanceApr 26
40% chanceApr 22
50% chanceApr 19
60% chanceApr 16
70% chanceApr 13
80% chanceApr 9
90% chanceApr 3
Probability of hard freeze (20°F) on or after…
10% chanceApr 23
20% chanceApr 19
30% chanceApr 15
40% chanceApr 12
50% chanceApr 9
60% chanceApr 5
70% chanceApr 2
80% chanceMar 30
90% chanceMar 24
Probability of severe hard freeze (16°F) on or after…
10% chanceApr 17
20% chanceApr 11
30% chanceApr 6
40% chanceApr 3
50% chanceMar 31
60% chanceMar 28
70% chanceMar 23
80% chanceMar 19
90% chanceMar 10

Agricultural climatic data from weather station: BIG TIMBER (USC00240780)

Back to Weather Calendar