When to plant in Spring Valley, CA
USDA Zone 10bSpring Valley, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Spring Valley enjoys a long ~349-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. Zone 10b is warm enough that Spring Valley can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Spring Valley is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
EL CAJON · 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 Spring Valley’s own odds, recorded at EL CAJON.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 3 | Feb 6 | Jan 6 | Nov 18 | Dec 6 | Dec 29 |
| 32°F | Feb 7 | Jan 6 | Dec 13 | Dec 1 | Dec 21 | Jan 15 |
| 28°F | Jan 15 | Dec 31 | Dec 8 | Dec 7 | Dec 30 | Jan 14 |
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 Spring Valley, 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.
Spring Valley planting FAQ
When is the last spring frost in Spring Valley, CA?
On average, the last spring frost in Spring Valley is around January 6 (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 Spring Valley, CA?
Expect Spring Valley's first fall frost near December 21 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Spring Valley in?
Spring Valley is in USDA hardiness zone 10b. In zone 10b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Spring Valley?
There are roughly 349 frost-free days in Spring Valley (a long growing season), running from the average last frost around January 6 to the first fall frost near December 21.
When should I plant tomatoes in Spring Valley?
In Spring Valley, start tomato seeds indoors around November 11–November 25, then transplant seedlings outdoors around January 13 once the danger of frost has passed.
Never miss a window in Spring Valley
An email when it’s time to start seeds, transplant, and sow — timed to Spring Valley’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- La Presa · 3 km
- Casa de Oro-Mount Helix · 4 km
- Lemon Grove · 5 km
- La Mesa · 6 km
- Rancho San Diego · 6 km
- Bonita · 7 km
- El Cajon · 8 km
- Bostonia · 10 km
Frost dates recorded at EL CAJON, 9 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 Spring Valley, CA — Frost Dates & Zone 10b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00042706. Retrieved from https://blissgarden.com/california/spring-valley.