🌷 Your Ultimate Garden Calendar!

🌷 Last Frost Dates for Portola Valley, California 94028

The last 36°F Spring frost date is 30% likely to be on Apr 30. (See detailed probabilities below.)

The last 32°F light freeze date is 30% likely to be on Mar 28. (See detailed probabilities below.)

(See also 🍂 First Fall Frost Dates.)

Last frost date probabilities for Portola Valley, CA 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 Last Frost Date?

The last spring frost signals when your area is safe from freezing temperatures. Tender plants can now grow outdoors without cold damage! This marks the beginning of the growing season. Last spring frost serves as your essential starting point for planting warm-season crops. It's also time to remove winter protection from your perennials. Enjoy the longer days and warmer weather!

How to use the Last Frost Date?

Start seeds indoors several weeks before your last frost date. This gives plants time to reach transplanting size when weather permits. Plan your outdoor planting schedule around your area's average last frost date. Plant some crops before and some after this date to protect against weather changes. Look for spots in your yard where frost stays longer or disappears earlier. Create your own frost map to use all available growing space and extend your season. Keep watching your local weather forecast to catch any surprise late frosts.

Last Frost Date Probabilities

Probability of frost (36°F) on or after…
10% chanceMay 11
20% chanceMay 4
30% chanceApr 30
40% chanceApr 25
50% chanceApr 20
60% chanceApr 16
70% chanceApr 11
80% chanceApr 5
90% chanceMar 29
Probability of light freeze (32°F) on or after…
10% chanceApr 18
20% chanceApr 4
30% chanceMar 28
40% chanceMar 18
50% chanceMar 10
60% chanceFeb 28
70% chanceFeb 23
80% chanceFeb 15
90% chanceFeb 2
Probability of moderate freeze (28°F) on or after…
10% chanceFeb 22
20% chanceFeb 14
30% chanceFeb 7
40% chanceFeb 1
50% chanceJan 28
60% chanceJan 21
70% chanceJan 12
80% chanceJan 1
90% chanceDec 25
Probability of moderate hard freeze (24°F) on or after…
10% chanceFeb 8
20% chanceFeb 1
30% chanceJan 20
40% chanceJan 11
50% chanceJan 4
60% chanceDec 31
70% chanceDec 27
80% chanceDec 21
90% chanceDec 12
Probability of hard freeze (20°F) on or after…
10% chancerarely
20% chancerarely
30% chancerarely
40% chancerarely
50% chancerarely
60% chancerarely
70% chancerarely
80% chancerarely
90% chancerarely
Probability of severe hard freeze (16°F) on or after…
10% chancerarely
20% chancerarely
30% chancerarely
40% chancerarely
50% chancerarely
60% chancerarely
70% chancerarely
80% chancerarely
90% chancerarely

Agricultural climatic data from weather station: WOODSIDE FIRE STN 1 (USC00049792)

Back to Weather Calendar