Blythe, CA planting zone & frost dates

Blythe is in USDA hardiness zone 9b. The last spring frost usually comes around January 25 and the first fall frost around December 12, for a growing season of about 325 days.

USDA hardiness zone9bavg. extreme winter low 25°F to 30°F

Average last spring frostJanuary 2590% chance of no frost after February 24

Average first fall frostDecember 1210% chance of frost by November 28

Growing season325 daysfrost-free days in an average year

Planting calendar for Blythe

Dates are counted from the average last spring frost (January 25) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.

Crop	When
Tomatoes	Start seeds indoors: Nov 30 – Dec 14 Transplant outdoors: Feb 1 – Feb 8
Peppers	Start seeds indoors: Nov 16 – Nov 30 Transplant outdoors: Feb 8 – Feb 15
Eggplant	Start seeds indoors: Nov 16 – Nov 30 Transplant outdoors: Feb 8 – Feb 15
Broccoli	Start seeds indoors: Nov 16 – Nov 30 Transplant outdoors: Dec 28 – Jan 11
Cabbage	Start seeds indoors: Nov 16 – Nov 30 Transplant outdoors: Dec 28 – Jan 11
Onions (sets)	Plant outdoors: Dec 28 – Jan 11
Peas	Sow outdoors: Dec 14 – Dec 28
Spinach	Sow outdoors: Dec 14 – Dec 28
Lettuce	Sow outdoors: Dec 28 – Jan 11
Carrots	Sow outdoors: Dec 28 – Jan 11
Potatoes	Plant outdoors: Dec 28 – Jan 11
Beans	Sow outdoors: Feb 1 – Feb 8
Sweet corn	Sow outdoors: Feb 1 – Feb 8
Cucumbers	Sow outdoors: Feb 1 – Feb 8
Squash & zucchini	Sow outdoors: Feb 1 – Feb 8
Basil	Start seeds indoors: Dec 14 – Dec 28 Transplant outdoors: Feb 1 – Feb 8

Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 17 (8 weeks before the average first fall frost on Dec 12).

Useful for zone 9b gardens

Seed starting kit with dome — to start seeds indoors before the last frost
LED grow light for seedlings — stops leggy seedlings
Frost cloth / plant covers — for late spring and early fall frosts
Soil thermometer — warm-season crops need soil above 60°F
Shade cloth — for hot summers

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Frost risk in detail

	90% chance	50% chance	10% chance
Last 32°F frost in spring is after	Dec 29	Jan 25	Feb 24
First 32°F frost in fall is before	Jan 3	Dec 12	Nov 28

How to read it: in spring there is a 10% chance of a frost after February 24, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 28. A hard freeze (28°F) usually ends around December 30.

Hardiness zone by ZIP code in Blythe

92225 zone 9b
92226 zone 9b

Nearby cities

Brawley zone 9b, last frost Jan 16
Imperial zone 10a
El Centro zone 10a
Calexico zone 10a
Twentynine Palms zone 9b, last frost Jan 24
Coachella zone 10a
Indio zone 10a
La Quinta zone 10a

All cities in California → · Other zone 9b cities →

Questions

What growing zone is Blythe, CA?

Blythe is in USDA Plant Hardiness Zone 9b (average extreme winter low 25°F to 30°F), according to the USDA 2023 map.

When is the last frost in Blythe?

The average last spring frost (32°F) in Blythe is January 25. There is still a 10% chance of frost until February 24.

When can I plant tomatoes in Blythe?

Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Feb 1 – Feb 8. Start seeds indoors 6–8 weeks before the last frost.

Frost dates: NOAA U.S. Climate Normals 1991–2020, station Blythe, CA (USC00040924), 0.3 km (0.2 mi) from the city center, elevation 82 m, based on 17 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.