Frost Dates & Planting Calendar for Redlands, CA

The average first fall frost in Redlands, CA is December 19, and the average last spring frost is January 27, giving a growing season of about 329 days.

Plan your garden around Redlands, CA's typical frost-free growing season, using NOAA climate normals and a 42-crop planting calendar built for this location.

Last Spring Frost

January 27

Safe Feb 28 Typical Jan 27 Risky Dec 21

First Fall Frost

December 19

Safe Dec 1 Typical Dec 19 Risky Jan 26

Growing Season

329 days

Typical last frost to typical first frost.

USDA Hardiness Zone

Zone 10a

Subtropical to frost-free — heat, not cold, is the main limit on what you can grow.

Data: NOAA station REDLANDS, CA US, 2.4 km away.

— days until the typical last spring frost

How Redlands Compares

Redlands's typical last spring frost (Jan 27) comes later than in 54% of the 427 California cities we track.
Its 329-day growing season is 8 days shorter than the California median of 337 days.
Redlands shares its NOAA weather station with San Bernardino (11 km away), so their typical frost dates are the same.
August is the warmest month (average high 96°F) and December the coldest (average low 40°F).

Monthly Temperatures

Avg. high Avg. temp Avg. low

Planting Calendar

Vegetables
Crop	Start indoors	Direct sow	Transplant	Fall planting	Maturity	Notes
Tomato	Dec 2 – Dec 16	—	Feb 3 – Feb 10	—	60–85 days	Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed.
Pepper	Nov 18 – Dec 2	—	Feb 3 – Feb 17	—	60–90 days	Slow to germinate; start indoors 8-10 weeks before last frost. Transplant only once nights stay above 55F, 1-3 weeks after last frost.
Eggplant	Nov 18 – Dec 2	—	Feb 10 – Feb 17	—	65–85 days	Warm-season crop, similar timing to pepper; needs consistently warm soil (65F+) to transplant.
Cucumber	Dec 30 – Jan 6	Feb 3 – Feb 10	Feb 3 – Feb 10	—	50–65 days	Can be started indoors 3-4 weeks before transplanting, or direct-sown 1-2 weeks after last frost once soil is warm.
Zucchini	Jan 6 – Jan 13	Feb 3 – Feb 17	Feb 3 – Feb 10	—	45–55 days	Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.
Winter Squash	Dec 30 – Jan 6	Feb 3 – Feb 17	Feb 3 – Feb 10	—	80–110 days	Long season; direct sow after soil warms, or start indoors 3-4 weeks before last frost in short-season climates.
Pumpkin	—	Feb 3 – Feb 17	—	—	90–120 days	Direct sow 1-3 weeks after last frost; back-time from your first fall frost so the 90-120 day maturity window lands before it.
Watermelon	Dec 30 – Jan 6	—	Feb 10 – Feb 17	—	70–90 days	Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost.
Cantaloupe	Dec 30 – Jan 6	—	Feb 10 – Feb 17	—	70–90 days	Same warm-soil requirements as watermelon; avoid disturbing roots when transplanting.
Corn	—	Jan 27 – Feb 10	—	—	60–100 days	Direct sow at last frost to 2 weeks after, once soil reaches 60F; does not transplant well. Succession sow every 2 weeks.
Green Bean	—	Jan 27 – Feb 10	—	—	50–65 days	Direct sow at last frost to 2 weeks after, once soil has warmed; frost-tender, do not rush.
Pea	—	Dec 16 – Dec 30	—	—	55–70 days	Cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked.
Lettuce	—	Dec 30 – Jan 13	—	Oct 24 – Nov 7	45–60 days	Cold-hardy; direct sow 2-4 weeks before last frost. Also transplantable from indoor starts.
Spinach	—	Dec 16 – Dec 30	—	Oct 24 – Nov 7	40–50 days	Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked.
Kale	—	Dec 30 – Jan 13	—	Oct 10 – Oct 24	50–65 days	Cold-hardy; direct sow 2-4 weeks before last frost or start indoors for earlier transplants.
Arugula	—	Dec 30 – Jan 13	—	Nov 7 – Nov 14	30–40 days	Fast-growing, cold-tolerant green; direct sow 2-4 weeks before last frost, succession sow every 2-3 weeks.
Swiss Chard	—	Jan 6 – Jan 20	—	—	50–60 days	Fairly cold-hardy; direct sow 1-3 weeks before last frost. Tolerates light frost in fall too.
Broccoli	Dec 9 – Dec 23	—	Jan 6 – Jan 13	Oct 17 – Oct 24	55–80 days	Start indoors 5-7 weeks before last frost; transplant out 2-3 weeks before last frost (hardens off to light frost).
Cauliflower	Dec 9 – Dec 23	—	Jan 13 – Jan 20	Oct 10 – Oct 17	55–85 days	Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost.
Cabbage	Dec 9 – Dec 23	—	Dec 30 – Jan 13	Oct 10 – Oct 24	60–100 days	Cold-hardy; start indoors 5-7 weeks before last frost, transplant 2-4 weeks before last frost.
Brussels Sprouts	Dec 9 – Dec 23	—	Jan 6 – Jan 20	—	90–110 days	Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost.
Carrot	—	Dec 30 – Jan 13	—	Sep 26 – Oct 10	60–80 days	Direct sow only (does not transplant); sow 2-4 weeks before last frost, as soon as soil can be worked.
Beet	—	Dec 30 – Jan 13	—	Oct 10 – Oct 24	50–65 days	Direct sow 2-4 weeks before last frost; tolerates light frost.
Radish	—	Dec 23 – Jan 6	—	Nov 7 – Nov 21	22–30 days	Very fast and cold-hardy; direct sow 3-5 weeks before last frost, as soon as soil can be worked.
Turnip	—	Dec 30 – Jan 13	—	Oct 10 – Oct 24	40–60 days	Cold-hardy; direct sow 2-4 weeks before last frost.
Onion	Nov 18 – Dec 2	—	Dec 30 – Jan 13	—	90–120 days	Start seeds indoors 8-10 weeks before last frost (or use sets/transplants); set out 2-4 weeks before last frost, very cold-tolerant as seedlings.
Garlic	—	—	—	Nov 21 – Dec 5	240–270 days	Fall-planted crop only; not planted in spring in most climates.
Potato	—	Dec 30 – Jan 13	—	—	70–120 days	Plant seed potatoes 2-4 weeks before last frost, as soon as soil can be worked and is above 45F; light frost on emerging foliage is usually tolerated.
Sweet Potato	—	—	Feb 10 – Feb 24	—	90–120 days	Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive.
Asparagus	—	—	Dec 30 – Jan 13	—	730–1095 days	Perennial; plant crowns 2-4 weeks before last frost as soon as soil can be worked. Takes 2-3 years to full production.

Herbs
Crop	Start indoors	Direct sow	Transplant	Fall planting	Maturity	Notes
Basil	Dec 16 – Dec 23	—	Feb 3 – Feb 10	—	50–70 days	Very frost/cold sensitive; start indoors 5-6 weeks before last frost, transplant only after all danger of frost (1-2 weeks after) and nights stay warm.
Cilantro	—	Jan 6 – Jan 20	—	Oct 24 – Nov 7	45–70 days	Cool-season, bolts in heat; direct sow 1-3 weeks before last frost, succession sow through spring.
Parsley	Dec 2 – Dec 16	—	Jan 13 – Jan 20	—	70–90 days	Slow to germinate; start indoors 6-8 weeks before last frost, transplant 1-2 weeks before last frost (biennial, cold-tolerant).
Dill	—	Jan 6 – Jan 20	—	—	40–60 days	Taprooted, does not transplant well; direct sow 1-3 weeks before last frost, succession sow through summer.
Oregano	Dec 2 – Dec 16	—	Jan 27 – Feb 3	—	80–90 days	Perennial herb; start indoors 6-8 weeks before last frost, transplant around/just after last frost date.
Thyme	Dec 2 – Dec 16	—	Jan 27 – Feb 3	—	85–95 days	Perennial herb, slow from seed; start indoors 6-8 weeks before last frost, transplant around/after last frost.

Flowers
Crop	Start indoors	Direct sow	Transplant	Fall planting	Maturity	Notes
Sunflower	—	Feb 3 – Feb 17	—	—	70–100 days	Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting.
Zinnia	Dec 30 – Jan 6	Feb 3 – Feb 17	Feb 3 – Feb 10	—	60–70 days	Frost-tender; direct sow 1-3 weeks after last frost, or start indoors 3-4 weeks early for earlier blooms.
Marigold	Dec 16 – Dec 30	—	Feb 3 – Feb 10	—	45–60 days	Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed.
Cosmos	Dec 30 – Jan 6	Feb 3 – Feb 17	Feb 3 – Feb 10	—	60–90 days	Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early.
Nasturtium	—	Feb 3 – Feb 17	—	—	50–65 days	Frost-tender, resents root disturbance; direct sow 1-3 weeks after last frost once soil has warmed.
Dahlia	—	—	Feb 3 – Feb 17	—	90–120 days	Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive.

Date ranges are estimates based on university extension guidelines and this city's NOAA frost normals — not a guarantee. Scroll to see all columns on narrow screens.

Frequently Asked Questions

When is the last frost in Redlands, CA?

Based on 1991–2020 NOAA climate normals for the REDLANDS, CA US station, the last spring frost in Redlands typically falls around January 27. A cautious gardener might wait until February 28 (only a 10% chance of a later frost), while December 21 marks an earlier, higher-risk planting date.

When is the first frost in Redlands, CA in fall?

The first fall frost in Redlands typically arrives around December 19. To stay safe, assume frost could start as early as December 1; in milder years it can hold off until January 26.

How long is the growing season in Redlands, CA?

Redlands's average frost-free growing season is about 329 days, running from the typical last spring frost (January 27) to the typical first fall frost (December 19).

What USDA hardiness zone is Redlands, CA in?

Redlands, CA is in USDA plant hardiness zone 10a, per the USDA's 2023 Plant Hardiness Zone Map. Subtropical to frost-free — heat, not cold, is the main limit on what you can grow.