Frost Dates for Redlands, CA 92374

Last spring frost January 26 · First fall frost December 15 · 323 frost-free days · USDA Zone 10a

Frost probability for 92374

Frost10%50%90%
Spring (last frost)March 9January 26—
Fall (first frost)November 15December 15—

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (3.8 km away); the 50% date is the median year.

Frost dates by ZIP code in Redlands, CA

ZIPLast spring frost (50%)First fall frost (50%)Zone
92374January 26December 1510a
92373January 26December 159b

Month by month in Redlands

MonthWhat to do
JanuaryLast frost around January 26. 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 15). Transplant fall brassicas. Sow spinach, arugula, and radishes.
DecemberFirst frost around December 15. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.

What grows in a 323-day season

Frequently Asked Questions

What is the last frost date for Redlands, CA (ZIP 92374)?

The median last spring frost date for Redlands, CA (ZIP code 92374) is around January 26. 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 Redlands, CA?

The median first fall frost date for Redlands, CA is around December 15. 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 Redlands, CA?

The frost-free growing season in Redlands is about 323 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 Redlands, CA?

Based on frost date patterns, Redlands 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 Redlands, CA?

Start tomato seeds indoors 6–8 weeks before your last frost date (around January 26). For Redlands, that's roughly December 1 to December 15. Transplant outdoors 1–2 weeks after your last frost.

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