🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Willcox, Arizona 85643

The first 36°F frost date is 30% likely to be on Oct 17. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 25. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Willcox, AZ 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% chanceOct 10
20% chanceOct 14
30% chanceOct 17
40% chanceOct 19
50% chanceOct 22
60% chanceOct 24
70% chanceOct 27
80% chanceOct 30
90% chanceNov 2
Probability of light freeze (32°F) on or before...
10% chanceOct 18
20% chanceOct 22
30% chanceOct 25
40% chanceOct 28
50% chanceOct 30
60% chanceNov 1
70% chanceNov 4
80% chanceNov 7
90% chanceNov 11
Probability of moderate freeze (28°F) on or before...
10% chanceOct 26
20% chanceOct 31
30% chanceNov 3
40% chanceNov 6
50% chanceNov 9
60% chanceNov 12
70% chanceNov 15
80% chanceNov 18
90% chanceNov 23
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 6
20% chanceNov 11
30% chanceNov 15
40% chanceNov 18
50% chanceNov 21
60% chanceNov 24
70% chanceNov 28
80% chanceDec 1
90% chanceDec 6
Probability of hard freeze (20°F) on or before...
10% chanceNov 19
20% chanceNov 24
30% chanceNov 28
40% chanceDec 1
50% chanceDec 4
60% chanceDec 8
70% chanceDec 12
80% chanceDec 19
90% chanceDec 28
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 30
20% chanceDec 5
30% chanceDec 11
40% chanceDec 16
50% chanceDec 22
60% chanceDec 27
70% chanceJan 1
80% chanceJan 9
90% chanceJan 24

Agricultural climatic data from weather station: WILLCOX (USC00029334)

Back to Weather Calendar