When to plant in Milpitas, CA
USDA Zone 10aMilpitas, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Milpitas enjoys a long ~344-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. In zone 10a, frost is a minor factor for Milpitas — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
SAN JOSE · 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 Milpitas’s own odds, recorded at SAN JOSE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 9 | Feb 12 | Jan 11 | Nov 17 | Dec 3 | Dec 31 |
| 32°F | Feb 14 | Jan 12 | Dec 20 | Dec 1 | Dec 22 | Jan 20 |
| 28°F | Jan 17 | Dec 31 | Dec 10 | Dec 6 | Dec 28 | 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 Milpitas, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 14 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.
Milpitas planting FAQ
When is the last spring frost in Milpitas, CA?
Plan for the last spring frost in Milpitas around January 12 (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 Milpitas, CA?
In Milpitas, the first 32°F freeze of fall lands around December 22 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Milpitas in?
Milpitas is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Milpitas?
Milpitas has about 344 frost-free days — a long growing season — between the average last spring frost (January 12) and first fall frost (December 22).
When should I plant tomatoes in Milpitas?
For Milpitas, sow tomatoes indoors about November 17–December 1 and move the seedlings out around January 19, after the last spring frost.
Never miss a window in Milpitas
An email when it’s time to start seeds, transplant, and sow — timed to Milpitas’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Fremont · 8 km
- Alum Rock · 9 km
- Santa Clara · 10 km
- Sunnyvale · 13 km
- Newark · 15 km
- San Jose · 17 km
- Mountain View · 17 km
- Campbell · 18 km
Frost dates recorded at SAN JOSE, 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 Milpitas, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00023293. Retrieved from https://blissgarden.com/california/milpitas.