When to plant in Rocklin, CA
USDA Zone 9bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Rocklin, California — all computed from Rocklin's nearest NOAA weather station.
Rocklin enjoys a long ~283-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. Heads up: the nearest complete-normals station is about 18 km from Rocklin, so your yard's frost dates can differ — a low spot or a paved city center can shift them by a week. Zone 9b is warm enough that Rocklin can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Rocklin is now 10 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
AUBURN · 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 Rocklin’s own odds, recorded at AUBURN.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 30 | Apr 5 | Mar 2 | Oct 30 | Nov 19 | Dec 7 |
| 32°F | Apr 7 | Feb 25 | Jan 15 | Nov 15 | Dec 5 | Dec 31 |
| 28°F | Feb 25 | Jan 13 | Dec 19 | Dec 1 | Dec 22 | Jan 22 |
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 Rocklin, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 32 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.
Rocklin planting FAQ
When is the last spring frost in Rocklin, CA?
Rocklin's average last spring frost falls near February 25 — 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 Rocklin, CA?
In Rocklin, the first 32°F freeze of fall lands around December 5 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Rocklin in?
Rocklin is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Rocklin?
There are roughly 283 frost-free days in Rocklin (a long growing season), running from the average last frost around February 25 to the first fall frost near December 5.
When should I plant tomatoes in Rocklin?
In Rocklin, start tomato seeds indoors around December 31–January 14, then transplant seedlings outdoors around March 4 once the danger of frost has passed.
Never miss a window in Rocklin
An email when it’s time to start seeds, transplant, and sow — timed to Rocklin’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Roseville · 7 km
- Lincoln · 8 km
- Granite Bay · 9 km
- Citrus Heights · 13 km
- Orangevale · 13 km
- Antelope · 14 km
- Foothill Farms · 16 km
- Fair Oaks · 17 km
Frost dates recorded at AUBURN, 18 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 Rocklin, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00040383. Retrieved from https://blissgarden.com/california/rocklin.