🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Winnett, Montana 59087

A 36°F frost is always a risk here. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 14. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Winnett, 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 First Frost Date?

The first fall frost signals the end of your local growing season. This date serves as an important deadline for gardeners and farmers. You'll need to complete harvesting before this point. Annuals and other tender plants will die back when frost hits, and perennial plants will enter their dormant phase for winter. Meanwhile, it's time to enjoy a cup of hot cocoa and a cozy sweater—and start planning your spring garden!

How to use the First Frost Date?

Watch your local weather forecasts in early fall to predict the first frost date. Harvest tender crops and protect vulnerable plants before frost arrives. For late-summer plantings, count backward from your area's average first frost date. This ensures your crops have enough time to mature. Keep track of when frost actually occurs in your garden each year. This helps you identify protected spots where the growing season might last longer.

First Frost Date Probabilities

Probability of frost (36°F) on or before...
10% chancealways
20% chancealways
30% chancealways
40% chancealways
50% chancealways
60% chancealways
70% chancealways
80% chancealways
90% chancealways
Probability of light freeze (32°F) on or before...
10% chanceSep 7
20% chanceSep 11
30% chanceSep 14
40% chanceSep 16
50% chanceSep 18
60% chanceSep 20
70% chanceSep 22
80% chanceSep 25
90% chanceSep 28
Probability of moderate freeze (28°F) on or before...
10% chanceSep 14
20% chanceSep 18
30% chanceSep 21
40% chanceSep 24
50% chanceSep 26
60% chanceSep 28
70% chanceOct 1
80% chanceOct 3
90% chanceOct 7
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 20
20% chanceSep 25
30% chanceSep 28
40% chanceOct 1
50% chanceOct 3
60% chanceOct 5
70% chanceOct 8
80% chanceOct 12
90% chanceOct 17
Probability of hard freeze (20°F) on or before...
10% chanceSep 26
20% chanceOct 1
30% chanceOct 5
40% chanceOct 8
50% chanceOct 12
60% chanceOct 15
70% chanceOct 18
80% chanceOct 22
90% chanceOct 27
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 3
20% chanceOct 9
30% chanceOct 14
40% chanceOct 18
50% chanceOct 21
60% chanceOct 25
70% chanceOct 28
80% chanceOct 31
90% chanceNov 6

Agricultural climatic data from weather station: VALENTINE (USC00248498)

Back to Weather Calendar