When to plant in Stevenson Ranch, CA
USDA Zone 10aEverything below — frost dates, hardiness zone, and what to plant when in Stevenson Ranch, California — is derived from the closest NOAA station with complete climate normals.
With only about -7 frost-free days, Stevenson Ranch has a short season — start heat-lovers indoors early, favor quick-maturing varieties, and use row cover to stretch both ends. Zone 10a is warm enough that Stevenson Ranch can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
NEWHALL 5NW · 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 Stevenson Ranch’s own odds, recorded at NEWHALL 5NW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 8 | Feb 22 | Dec 21 | Nov 23 | Dec 19 | Feb 8 |
| 32°F | Mar 10 | Jan 8 | Dec 8 | Nov 30 | Jan 1 | Feb 25 |
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 Stevenson Ranch, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Stevenson Ranch planting FAQ
When is the last spring frost in Stevenson Ranch, CA?
On average, the last spring frost in Stevenson Ranch is around January 8 (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 Stevenson Ranch, CA?
In Stevenson Ranch, the first 32°F freeze of fall lands around January 1 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Stevenson Ranch in?
Stevenson Ranch is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Stevenson Ranch?
There are roughly -7 frost-free days in Stevenson Ranch (a short growing season), running from the average last frost around January 8 to the first fall frost near January 1.
When should I plant tomatoes in Stevenson Ranch?
In Stevenson Ranch, start tomato seeds indoors around November 13–November 27, then transplant seedlings outdoors around January 15 once the danger of frost has passed.
Never miss a window in Stevenson Ranch
An email when it’s time to start seeds, transplant, and sow — timed to Stevenson Ranch’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Santa Clarita · 8 km
- Castaic · 11 km
- San Fernando · 18 km
- Simi Valley · 20 km
- Oak Park · 28 km
- Moorpark · 29 km
- Calabasas · 29 km
- Fillmore · 31 km
Frost dates recorded at NEWHALL 5NW, 1 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 Stevenson Ranch, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00046161. Retrieved from https://blissgarden.com/california/stevenson-ranch.