Frost Dates for Hayward, CA 94545

Hayward has 4 ZIP codes. The Hayward, CA frost page lists all of them with their dates.

Last spring frost February 3 · First fall frost December 11 · 311 frost-free days · USDA Zone 10a

Frost probability for 94545

Frost10%50%90%
Spring (last frost)February 28February 3December 20
Fall (first frost)November 18December 11January 15

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (20.8 km away); the 50% date is the median year.

Month by month in Hayward

MonthWhat to do
JanuaryStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
FebruaryLast frost around February 3. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
MarchFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
AprilSuccession plant lettuce and greens. Keep beds weeded and watered consistently.
MayHarvest regularly to encourage production. Monitor for pests and disease.
JuneMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
JulyDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
AugustDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
SeptemberDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
OctoberDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
NovemberFirst fall frost approaching (around December 11). Transplant fall brassicas. Sow spinach, arugula, and radishes.
DecemberFirst frost around December 11. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.

What grows in a 311-day season

Frequently Asked Questions

What is the last frost date for Hayward, CA (ZIP 94545)?

The median last spring frost date for Hayward, CA (ZIP code 94545) is around February 3. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in Hayward, CA?

The median first fall frost date for Hayward, CA is around December 11. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in Hayward, CA?

The frost-free growing season in Hayward is about 311 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is Hayward, CA?

Based on frost date patterns, Hayward falls approximately in 10a. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in Hayward, CA?

Start tomato seeds indoors 6–8 weeks before your last frost date (around February 3). For Hayward, that's roughly December 9 to December 23. Transplant outdoors 1–2 weeks after your last frost.

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