When to plant in Twentynine Palms, CA
USDA Zone 9bTwentynine Palms, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Twentynine Palms enjoys a long ~320-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. In zone 9b, frost is a minor factor for Twentynine Palms — most perennials thrive, and annual vegetables can go out early and stay late.
The average last spring frost in Twentynine Palms is now 8 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
TWENTYNINE PALMS · 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 Twentynine Palms’s own odds, recorded at TWENTYNINE PALMS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 11 | Feb 19 | Jan 22 | Nov 13 | Nov 27 | Dec 13 |
| 32°F | Feb 22 | Jan 24 | Dec 22 | Nov 24 | Dec 10 | Jan 1 |
| 28°F | Feb 8 | Jan 3 | Dec 11 | Dec 3 | Dec 23 | Jan 28 |
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 Twentynine Palms, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 30 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.
Twentynine Palms planting FAQ
When is the last spring frost in Twentynine Palms, CA?
On average, the last spring frost in Twentynine Palms is around January 24 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Twentynine Palms, CA?
The first fall frost in Twentynine Palms typically arrives around December 10 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Twentynine Palms in?
Twentynine Palms is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Twentynine Palms?
Twentynine Palms has about 320 frost-free days — a long growing season — between the average last spring frost (January 24) and first fall frost (December 10).
When should I plant tomatoes in Twentynine Palms?
For Twentynine Palms, sow tomatoes indoors about November 29–December 13 and move the seedlings out around January 31, after the last spring frost.
Never miss a window in Twentynine Palms
An email when it’s time to start seeds, transplant, and sow — timed to Twentynine Palms’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Yucca Valley · 33 km
- Desert Hot Springs · 49 km
- Indio · 49 km
- Cathedral City · 50 km
- Coachella · 51 km
- Palm Desert · 53 km
- Rancho Mirage · 54 km
- Palm Springs · 58 km
Frost dates recorded at TWENTYNINE PALMS, 3 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 Twentynine Palms, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00049099. Retrieved from https://blissgarden.com/california/twentynine-palms.