When to plant in Quartz Hill, CA
USDA Zone 9aQuartz Hill, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 9a is warm enough that Quartz Hill can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
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 Quartz Hill’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 Quartz Hill, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Quartz Hill planting FAQ
When is the last spring frost in Quartz Hill, CA?
Plan for the last spring frost in Quartz Hill around April 3 (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 Quartz Hill, CA?
The first fall frost in Quartz Hill typically arrives around November 1 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Quartz Hill in?
Quartz Hill is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Quartz Hill?
There are roughly 212 frost-free days in Quartz Hill (a long growing season), running from the average last frost around April 3 to the first fall frost near November 1.
When should I plant tomatoes in Quartz Hill?
In Quartz Hill, start tomato seeds indoors around February 6–February 20, then transplant seedlings outdoors around April 10 once the danger of frost has passed.
Never miss a window in Quartz Hill
An email when it’s time to start seeds, transplant, and sow — timed to Quartz Hill’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lancaster · 6 km
- Palmdale · 12 km
- Rosamond · 24 km
- Sun Village · 26 km
- Lake Los Angeles · 36 km
- Santa Clarita · 37 km
- Castaic · 43 km
- Stevenson Ranch · 45 km
Frost dates recorded at LANCASTER WM J FOX FLD, 10 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 Quartz Hill, CA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003159. Retrieved from https://blissgarden.com/california/quartz-hill.