🌷 Your Ultimate Garden Calendar!

🍂 2026 First Frost Dates for Salt Lake City, Utah 84121

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 12. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Salt Lake City, UT 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 3
20% chanceSep 8
30% chanceSep 12
40% chanceSep 15
50% chanceSep 18
60% chanceSep 21
70% chanceSep 23
80% chanceSep 26
90% chanceSep 29
Probability of moderate freeze (28°F) on or before...
10% chanceSep 11
20% chanceSep 17
30% chanceSep 20
40% chanceSep 23
50% chanceSep 26
60% chanceSep 28
70% chanceOct 1
80% chanceOct 4
90% chanceOct 9
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 19
20% chanceSep 24
30% chanceSep 28
40% chanceOct 1
50% chanceOct 4
60% chanceOct 7
70% chanceOct 11
80% chanceOct 16
90% chanceOct 22
Probability of hard freeze (20°F) on or before...
10% chanceSep 29
20% chanceOct 4
30% chanceOct 8
40% chanceOct 12
50% chanceOct 17
60% chanceOct 20
70% chanceOct 24
80% chanceOct 28
90% chanceNov 3
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 9
20% chanceOct 16
30% chanceOct 21
40% chanceOct 25
50% chanceOct 28
60% chanceNov 1
70% chanceNov 3
80% chanceNov 7
90% chanceNov 11

Agricultural climatic data from weather station: ALTA (USC00420072)

Back to Weather Calendar