When is the last frost in Rocklin, CA?

The average last spring frost (50% probability of 32°F) in Rocklin is around February 25, based on NOAA/NCEI 1991–2020 normals at the Auburn, CA station (11.2 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Rocklin?

The average first fall frost in Rocklin, CA is around December 5, giving roughly a 286-day frost-free growing season.

What planting zone is Rocklin, CA?

Rocklin is in USDA plant hardiness zone 9b (average annual extreme minimum temperature 25 to 30°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Rocklin?

In Rocklin, CA the warmest month is July (avg high 92.7°F) and the coldest is December (avg low 37.2°F). It averages about 36.1″ of precipitation a year.

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Rocklin, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 95677 · elevation 394′ · NOAA & USDA data

Rocklin is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 286 days between the average last spring frost (February 25) and first fall frost (December 5). The warmest month is July (avg high 92.7°F); the coldest is December (avg low 37.2°F). It averages 36.1″ of precipitation a year. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 25 to 30°F

Last spring frost

February 25

avg (50% prob, 32°F)

First fall frost

December 5

avg (50% prob, 32°F)

Growing season

286 days

frost-free window

Warmest month

July

avg high 92.7°F

Month-by-month typical weather in Rocklin

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Auburn, CA (11.2 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	56.3	37.8	47.1	7	–
February	59.4	40	49.7	6.5	–
March	63.1	42.3	52.7	6.1	–
April	68.1	44.8	56.4	2.8	–
May	76.9	51.5	64.2	1.7	–
June	85.7	57.5	71.6	0.4	–
July	92.7	63.4	78.1	0	–
August	92	62.8	77.4	0.1	–
September	86.8	59.5	73.2	0.2	–
October	76.9	51.6	64.3	1.4	–
November	63.8	43.1	53.4	3.1	–
December	55.8	37.2	46.5	6.8	–

What to plant when in Rocklin

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 14 · Transplant out: March 4
Peppers	warm	Start seeds indoors: December 31 · Transplant out: March 11
Cucumbers	warm	Direct sow: March 4
Zucchini / squash	warm	Direct sow: March 4
Bush beans	warm	Direct sow: March 4
Sweet corn	warm	Direct sow: March 4
Basil	warm	Transplant out: March 4
Peas	cool	Sow (spring): January 21 · Sow (fall): October 10
Spinach	cool	Sow (spring): January 14 · Sow (fall): October 10
Lettuce	cool	Sow (spring): January 28 · Sow (fall): October 10
Kale	cool	Transplant (spring): February 4 · Sow (fall): September 26
Broccoli	cool	Transplant (spring): February 11
Carrots	cool	Sow (spring): February 4 · Sow (fall): September 26
Onions	cool	Transplant (spring): January 28
Potatoes	cool	Plant seed potatoes: February 11
Radishes	cool	Sow (spring): January 28 · Sow (fall): October 24

Dates are computed from Rocklin's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in California

Roseville, CA Citrus Heights, CA Lincoln, CA Folsom, CA Rancho Cordova, CA Sacramento, CA West Sacramento, CA Yuba City, CA

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Auburn, CA, 11.2 mi (confidence: medium). Monthly weather normals: Auburn, CA, 11.2 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.