When to plant in Rosamond, CA
USDA Zone 8bEverything below — frost dates, hardiness zone, and what to plant when in Rosamond, California — is derived from the closest NOAA station with complete climate normals.
In zone 8b, Rosamond supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
LANCASTER WM J FOX FLD · 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 Rosamond’s own odds, recorded at LANCASTER WM J FOX FLD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 19 | Mar 31 | Oct 7 | Oct 22 | Nov 3 |
| 32°F | Apr 23 | Apr 3 | Mar 8 | Oct 17 | Nov 1 | Nov 14 |
| 28°F | Apr 7 | Mar 8 | Feb 14 | Oct 28 | Nov 10 | Nov 26 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Rosamond, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 27 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.
Rosamond planting FAQ
When is the last spring frost in Rosamond, CA?
Rosamond's average last spring frost falls near April 3 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Rosamond, CA?
Expect Rosamond's first fall frost near November 1 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Rosamond in?
Rosamond is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Rosamond?
Rosamond has about 212 frost-free days — a long growing season — between the average last spring frost (April 3) and first fall frost (November 1).
When should I plant tomatoes in Rosamond?
For Rosamond, sow tomatoes indoors about February 6–February 20 and move the seedlings out around April 10, after the last spring frost.
Never miss a window in Rosamond
An email when it’s time to start seeds, transplant, and sow — timed to Rosamond’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lancaster · 19 km
- Quartz Hill · 24 km
- Palmdale · 32 km
- Tehachapi · 37 km
- Sun Village · 41 km
- California City · 44 km
- Lake Los Angeles · 45 km
- Santa Clarita · 56 km
Frost dates recorded at LANCASTER WM J FOX FLD, 14 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 Rosamond, CA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003159. Retrieved from https://blissgarden.com/california/rosamond.