When to plant in Jurupa Valley, CA
USDA Zone 10aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Jurupa Valley, California — all computed from Jurupa Valley's nearest NOAA weather station.
Jurupa Valley enjoys a long ~355-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 Jurupa Valley can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Jurupa Valley is now 5 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
RIVERSIDE MUNI AP · 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 Jurupa Valley’s own odds, recorded at RIVERSIDE MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 13 | Feb 13 | Jan 2 | Nov 23 | Dec 12 | Jan 9 |
| 32°F | Feb 21 | Jan 9 | Dec 16 | Dec 5 | Dec 30 | Feb 6 |
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 Jurupa Valley, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 11 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.
Jurupa Valley planting FAQ
When is the last spring frost in Jurupa Valley, CA?
Jurupa Valley's average last spring frost falls near January 9 — 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 Jurupa Valley, CA?
The first fall frost in Jurupa Valley typically arrives around December 30 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Jurupa Valley in?
Jurupa Valley is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Jurupa Valley?
There are roughly 355 frost-free days in Jurupa Valley (a long growing season), running from the average last frost around January 9 to the first fall frost near December 30.
When should I plant tomatoes in Jurupa Valley?
In Jurupa Valley, start tomato seeds indoors around November 14–November 28, then transplant seedlings outdoors around January 16 once the danger of frost has passed.
Never miss a window in Jurupa Valley
An email when it’s time to start seeds, transplant, and sow — timed to Jurupa Valley’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Bloomington · 9 km
- Riverside · 10 km
- Eastvale · 11 km
- Norco · 12 km
- Fontana · 12 km
- Ontario · 13 km
- Colton · 14 km
- Home Gardens · 14 km
Frost dates recorded at RIVERSIDE MUNI AP, 6 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 Jurupa Valley, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003171. Retrieved from https://blissgarden.com/california/jurupa-valley.