Frost Dates for Chino, CA 91710

Last spring frost January 19 · First fall frost December 21 · 336 frost-free days · USDA Zone 10a

Frost probability for 91710

Frost10%50%90%
Spring (last frost)March 5January 19—
Fall (first frost)November 18December 21—

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (11.5 km away); the 50% date is the median year.

Frost dates by ZIP code in Chino, CA

ZIPLast spring frost (50%)First fall frost (50%)Zone
91710January 19December 2110a
91708January 19December 219b

Month by month in Chino

MonthWhat to do
JanuaryLast frost around January 19. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
FebruaryFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
MarchSuccession plant lettuce and greens. Keep beds weeded and watered consistently.
AprilHarvest regularly to encourage production. Monitor for pests and disease.
MayMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
JuneDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
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 21). Transplant fall brassicas. Sow spinach, arugula, and radishes.
DecemberFirst frost around December 21. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.

What grows in a 336-day season

Frequently Asked Questions

What is the last frost date for Chino, CA (ZIP 91710)?

The median last spring frost date for Chino, CA (ZIP code 91710) is around January 19. 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 Chino, CA?

The median first fall frost date for Chino, CA is around December 21. 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 Chino, CA?

The frost-free growing season in Chino is about 336 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 Chino, CA?

Based on frost date patterns, Chino 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 Chino, CA?

Start tomato seeds indoors 6–8 weeks before your last frost date (around January 19). For Chino, that's roughly November 24 to December 8. Transplant outdoors 1–2 weeks after your last frost.

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