🍂 2026 First Frost Dates for Phoenix, Arizona 85022

📍 Almanac Zip Code Search
AZ
Phoenix
🍂 2026 First Fall Frost Dates

The first 36°F frost date is 30% likely to be on Dec 5. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Dec 15. (See detailed probabilities below.)

First frost date probabilities for Phoenix, 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% chance	Nov 25
20% chance	Dec 1
30% chance	Dec 5
40% chance	Dec 8
50% chance	Dec 11
60% chance	Dec 15
70% chance	Dec 18
80% chance	Dec 23
90% chance	Dec 29

Probability of light freeze (32°F) on or before...
10% chance	Dec 5
20% chance	Dec 11
30% chance	Dec 15
40% chance	Dec 20
50% chance	Dec 25
60% chance	Dec 29
70% chance	Jan 2
80% chance	Jan 9
90% chance	Jan 23

Probability of moderate freeze (28°F) on or before...
10% chance	Dec 14
20% chance	Dec 27
30% chance	Dec 31
40% chance	Jan 3
50% chance	Jan 7
60% chance	Jan 11
70% chance	Jan 17
80% chance	Jan 23
90% chance	Feb 1

Probability of moderate hard freeze (24°F) on or before...
10% chance	rarely
20% chance	rarely
30% chance	rarely
40% chance	rarely
50% chance	rarely
60% chance	rarely
70% chance	rarely
80% chance	rarely
90% chance	rarely

Probability of hard freeze (20°F) on or before...
10% chance	rarely
20% chance	rarely
30% chance	rarely
40% chance	rarely
50% chance	rarely
60% chance	rarely
70% chance	rarely
80% chance	rarely
90% chance	rarely

Probability of severe hard freeze (16°F) on or before...
10% chance	rarely
20% chance	rarely
30% chance	rarely
40% chance	rarely
50% chance	rarely
60% chance	rarely
70% chance	rarely
80% chance	rarely
90% chance	rarely

Agricultural climatic data from weather station: PHOENIX DEER VALLEY MUNI AP (USW00003184:frost)

Back to Weather Calendar