🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Arivaca, Arizona 85601

The first 36°F frost date is 30% likely to be on Oct 20. (See detailed probabilities below.)

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

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Arivaca, 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 13
20% chanceOct 17
30% chanceOct 20
40% chanceOct 22
50% chanceOct 25
60% chanceOct 28
70% chanceOct 31
80% chanceNov 2
90% chanceNov 6
Probability of light freeze (32°F) on or before...
10% chanceOct 21
20% chanceOct 26
30% chanceOct 30
40% chanceNov 1
50% chanceNov 4
60% chanceNov 7
70% chanceNov 9
80% chanceNov 12
90% chanceNov 16
Probability of moderate freeze (28°F) on or before...
10% chanceOct 31
20% chanceNov 5
30% chanceNov 8
40% chanceNov 12
50% chanceNov 14
60% chanceNov 17
70% chanceNov 19
80% chanceNov 23
90% chanceNov 28
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 11
20% chanceNov 16
30% chanceNov 20
40% chanceNov 24
50% chanceNov 27
60% chanceDec 1
70% chanceDec 4
80% chanceDec 8
90% chanceDec 14
Probability of hard freeze (20°F) on or before...
10% chanceNov 25
20% chanceNov 30
30% chanceDec 4
40% chanceDec 8
50% chanceDec 12
60% chanceDec 18
70% chanceDec 24
80% chanceJan 1
90% chanceJan 14
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 4
20% chanceDec 11
30% chanceDec 18
40% chanceDec 24
50% chanceDec 29
60% chanceJan 2
70% chanceJan 9
80% chanceJan 22
90% chanceFeb 3

Agricultural climatic data from weather station: SASABE 6 NNE (USC00027625)

Back to Weather Calendar