When to plant in Santee, CA
USDA Zone 10aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Santee, California — all computed from Santee's nearest NOAA weather station.
Santee 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 10a is warm enough that Santee can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Santee 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 Santee’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 Santee, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 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.
Santee planting FAQ
When is the last spring frost in Santee, CA?
On average, the last spring frost in Santee 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 Santee, CA?
The first fall frost in Santee typically arrives around December 21 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Santee in?
Santee is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Santee?
There are roughly 349 frost-free days in Santee (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 Santee?
In Santee, 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 Santee
An email when it’s time to start seeds, transplant, and sow — timed to Santee’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Bostonia · 6 km
- Winter Gardens · 6 km
- El Cajon · 6 km
- Lakeside · 8 km
- La Mesa · 10 km
- Casa de Oro-Mount Helix · 10 km
- Rancho San Diego · 12 km
- San Diego · 13 km
Frost dates recorded at EL CAJON, 8 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 Santee, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00042706. Retrieved from https://blissgarden.com/california/santee.