When to plant in Sierra Madre, CA
USDA Zone 10aSierra Madre, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 10a, frost is a minor factor for Sierra Madre — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
MT WILSON CBS · 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 Sierra Madre’s own odds, recorded at MT WILSON CBS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 4 | May 15 | Apr 21 | Oct 3 | Oct 30 | Nov 19 |
| 32°F | May 27 | Apr 28 | Mar 31 | Oct 18 | Nov 15 | Dec 9 |
| 28°F | May 10 | Apr 8 | Feb 28 | Nov 5 | Dec 4 | Dec 29 |
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 Sierra Madre, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 10 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.
Sierra Madre planting FAQ
When is the last spring frost in Sierra Madre, CA?
Sierra Madre's average last spring frost falls near April 28 — 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 Sierra Madre, CA?
Expect Sierra Madre's first fall frost near November 15 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Sierra Madre in?
Sierra Madre is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Sierra Madre?
Sierra Madre has about 201 frost-free days — a moderate growing season — between the average last spring frost (April 28) and first fall frost (November 15).
When should I plant tomatoes in Sierra Madre?
For Sierra Madre, sow tomatoes indoors about March 3–March 17 and move the seedlings out around May 5, after the last spring frost.
Never miss a window in Sierra Madre
An email when it’s time to start seeds, transplant, and sow — timed to Sierra Madre’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Arcadia · 4 km
- Monrovia · 6 km
- East San Gabriel · 6 km
- Temple City · 7 km
- San Marino · 8 km
- Pasadena · 8 km
- Altadena · 8 km
- Duarte · 9 km
Frost dates recorded at MT WILSON CBS, 7 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 Sierra Madre, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00046006. Retrieved from https://blissgarden.com/california/sierra-madre.