When to plant in Blythe, CA
USDA Zone 9bEverything below — frost dates, hardiness zone, and what to plant when in Blythe, California — is derived from the closest NOAA station with complete climate normals.
A generous ~321-day season lets Blythe gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. In zone 9b, frost is a minor factor for Blythe — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
BLYTHE · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Blythe’s own odds, recorded at BLYTHE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 10 | Feb 21 | Jan 25 | Nov 16 | Dec 1 | Dec 16 |
| 32°F | Feb 24 | Jan 25 | Dec 29 | Nov 28 | Dec 12 | Jan 3 |
| 28°F | Jan 30 | Dec 30 | Dec 10 | Dec 5 | Dec 22 | Jan 11 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in Blythe, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 15 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Blythe planting FAQ
When is the last spring frost in Blythe, CA?
Plan for the last spring frost in Blythe around January 25 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Blythe, CA?
The first fall frost in Blythe typically arrives around December 12 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Blythe in?
Blythe is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Blythe?
Blythe has about 321 frost-free days — a long growing season — between the average last spring frost (January 25) and first fall frost (December 12).
When should I plant tomatoes in Blythe?
For Blythe, sow tomatoes indoors about November 30–December 14 and move the seedlings out around February 1, after the last spring frost.
Never miss a window in Blythe
An email when it’s time to start seeds, transplant, and sow — timed to Blythe’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lake Havasu City · 98 km
- Fortuna Foothills · 112 km
- Brawley · 113 km
- Somerton · 117 km
- Imperial · 127 km
- Yuma · 127 km
- El Centro · 130 km
- San Luis · 130 km
Frost dates recorded at BLYTHE, 5 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Blythe, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00040924. Retrieved from https://blissgarden.com/california/blythe.