🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Lame Deer, Montana 59043

The first 36°F frost date is 30% likely to be on Sep 9. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 17. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Lame Deer, 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% chanceSep 1
20% chanceSep 5
30% chanceSep 9
40% chanceSep 11
50% chanceSep 14
60% chanceSep 16
70% chanceSep 18
80% chanceSep 21
90% chanceSep 25
Probability of light freeze (32°F) on or before...
10% chanceSep 10
20% chanceSep 14
30% chanceSep 17
40% chanceSep 20
50% chanceSep 22
60% chanceSep 25
70% chanceSep 27
80% chanceOct 1
90% chanceOct 4
Probability of moderate freeze (28°F) on or before...
10% chanceSep 17
20% chanceSep 22
30% chanceSep 25
40% chanceSep 28
50% chanceOct 1
60% chanceOct 3
70% chanceOct 6
80% chanceOct 9
90% chanceOct 14
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 25
20% chanceSep 30
30% chanceOct 4
40% chanceOct 7
50% chanceOct 11
60% chanceOct 14
70% chanceOct 17
80% chanceOct 21
90% chanceOct 25
Probability of hard freeze (20°F) on or before...
10% chanceOct 3
20% chanceOct 9
30% chanceOct 15
40% chanceOct 18
50% chanceOct 21
60% chanceOct 24
70% chanceOct 27
80% chanceOct 30
90% chanceNov 4
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 13
20% chanceOct 19
30% chanceOct 23
40% chanceOct 26
50% chanceOct 30
60% chanceNov 1
70% chanceNov 5
80% chanceNov 10
90% chanceNov 16

Agricultural climatic data from weather station: BIRNEY (USC00240819)

Back to Weather Calendar