When is the last frost in Redlands, CA?

The average last spring frost (50% probability of 32°F) in Redlands is around January 27, based on NOAA/NCEI 1991–2020 normals at the Redlands, CA station (2.4 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Redlands?

The average first fall frost in Redlands, CA is around December 19, giving roughly a 329-day frost-free growing season.

What planting zone is Redlands, CA?

Redlands is in USDA plant hardiness zone 10a (average annual extreme minimum temperature 30 to 35°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Redlands?

In Redlands, CA the warmest month is August (avg high 96.2°F) and the coldest is December (avg low 40.1°F). It averages about 12.9″ of precipitation a year.

Home › California › Redlands

Redlands, CA Planting Calendar & Frost Dates

USDA hardiness zone 10a · ZIP 92374 · elevation 430′ · NOAA & USDA data

Redlands is in USDA hardiness zone 10a (winters can dip to 30 to 35°F), with a growing season of about 329 days between the average last spring frost (January 27) and first fall frost (December 19). The warmest month is August (avg high 96.2°F); the coldest is December (avg low 40.1°F). It averages 12.9″ of precipitation a year. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

10a

min temp 30 to 35°F

Last spring frost

January 27

avg (50% prob, 32°F)

First fall frost

December 19

avg (50% prob, 32°F)

Growing season

329 days

frost-free window

Warmest month

August

avg high 96.2°F

Month-by-month typical weather in Redlands

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Redlands, CA (2.4 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	66.6	41.1	53.8	2.8
February	67.4	42.3	54.8	3
March	70.9	44.6	57.7	2
April	75.6	47.7	61.7	0.9
May	80.3	52.4	66.4	0.4
June	88.5	56.4	72.4	0.1
July	95.4	62.5	78.9	0.1
August	96.2	62.9	79.6	0.1
September	92.3	59.6	76	0.1
October	82.9	52.9	67.9	0.5
November	75	45.3	60.1	0.9
December	66.5	40.1	53.3	2

What to plant when in Redlands

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: December 16 · Transplant out: February 3
Peppers	warm	Start seeds indoors: December 2 · Transplant out: February 10
Cucumbers	warm	Direct sow: February 3
Zucchini / squash	warm	Direct sow: February 3
Bush beans	warm	Direct sow: February 3
Sweet corn	warm	Direct sow: February 3
Basil	warm	Transplant out: February 3
Peas	cool	Sow (spring): December 23 · Sow (fall): October 24
Spinach	cool	Sow (spring): December 16 · Sow (fall): October 24
Lettuce	cool	Sow (spring): December 30 · Sow (fall): October 24
Kale	cool	Transplant (spring): January 6 · Sow (fall): October 10
Broccoli	cool	Transplant (spring): January 13
Carrots	cool	Sow (spring): January 6 · Sow (fall): October 10
Onions	cool	Transplant (spring): December 30
Potatoes	cool	Plant seed potatoes: January 13
Radishes	cool	Sow (spring): December 30 · Sow (fall): November 7

Dates are computed from Redlands's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

Want the exact dates for your yard? →
Look up your precise ZIP-code frost dates and a full 26-crop planting calendar on our free interactive tool.
Open the frost & planting tool

🌾 Get a frost reminder

One email in early spring and early fall with the dates for your area. No spam.

Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in California

Highland, CA Colton, CA San Bernardino, CA Yucaipa, CA Moreno Valley, CA Rialto, CA Beaumont, CA Fontana, CA

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Redlands, CA, 2.4 mi (confidence: high). Monthly weather normals: Redlands, CA, 2.4 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.