When is the last spring frost in Murrieta, CA?

The median last 32°F date at the station on this page is February 2. NOAA’s 1991–2020 normals give a 50% chance the last spring minimum of 32°F or lower occurs on or after that date. The 90% date is December 26. The 10% date, the later one, is February 24. These are normals, not a forecast for this spring.

What USDA zone is Murrieta, CA?

The zone on this page is 9b, from ZIP 92563 in the 2023 PRISM table of the USDA Plant Hardiness Zone Map. That ZIP is 2.6 miles from the city point. USDA defines the zone as the average annual extreme minimum, shown here as 25°F to 30°F. It is a winter-cold band, not a frost date and not a forecast.

How far away is the weather station?

The station named on this page is 9.3 miles from the city point in a straight line. Frost dates are 1991–2020 NOAA climate normals for that instrument. They are not a National Weather Service forecast for one night, and they are not the temperature in every yard. The page names the station so the miles stay attached to the dates.

Frost dates in Murrieta, CA

Direct answer. In Murrieta, CA, the nearest qualified NOAA station is FALLBROOK 5 NE, CA US (USW00053151), 9.3 miles from the city point. The median last 32°F date is February 2, and the median first 32°F date is January 30, from the 1991–2020 U.S. Climate Normals. The 2023 USDA zone is 9b (25°F to 30°F), from ZIP 92563 in the PRISM table, 2.6 miles from the same city point.

Population in the Census 2024 estimate is 112,539. The station is FALLBROOK 5 NE, CA US (USW00053151).

Zone 9bUSDA average annual extreme minimum 25°F to 30°F, from ZIP 92563 (2.6 miles from the city point used on this page).

Median last 32°F is February 2. Median first 32°F is January 30. The 50% growing-season length is 365 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	December 26	Earlier date. A last 32°F on or after this day is common.
50%	February 2	Median.
10%	February 24	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	December 23	Earlier date. A first 32°F on or before this day is uncommon.
50%	January 30	Median.
90%	February 24	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	365
50%	365
90%	356

36°F threshold

	10%	50%	90%
Last, on or after	March 6	February 7	December 21
First, on or before	December 11	January 1	February 17
Season at least	365 days	346 days	295 days

Station FALLBROOK 5 NE, CA US (USW00053151). Completeness flag R, 13 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 17.1%. Freeze dates are conditional on that threshold occurring. Elevation 347.5 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

Questions

When is the last spring frost in Murrieta, CA?: The median last 32°F date at the station on this page is February 2. NOAA’s 1991–2020 normals give a 50% chance the last spring minimum of 32°F or lower occurs on or after that date. The 90% date is December 26. The 10% date, the later one, is February 24. These are normals, not a forecast for this spring.
What USDA zone is Murrieta, CA?: The zone on this page is 9b, from ZIP 92563 in the 2023 PRISM table of the USDA Plant Hardiness Zone Map. That ZIP is 2.6 miles from the city point. USDA defines the zone as the average annual extreme minimum, shown here as 25°F to 30°F. It is a winter-cold band, not a frost date and not a forecast.
How far away is the weather station?: The station named on this page is 9.3 miles from the city point in a straight line. Frost dates are 1991–2020 NOAA climate normals for that instrument. They are not a National Weather Service forecast for one night, and they are not the temperature in every yard. The page names the station so the miles stay attached to the dates.

Planting calendar for Murrieta · Zone 9b

Check a crop against this station

Murrieta, CA

Zone 9bAverage annual extreme minimum 25°F to 30°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

California. Nearest qualified station: FALLBROOK 5 NE, CA US (USW00053151), 9.3 miles. Median last 32°F February 2. Median first 32°F January 30. The 50% growing-season length is 365 days.

Open the ZIP page · Crop guides for California

32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	February 24	February 2	December 26
First 32°F on or before	December 23	January 30	February 24

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

A wall calendar surrounded by vegetables, herbs, seed packets, and watering cans.

Planting calendar

Windows below are from UC ANR, UC Master Gardener Program, Time of planting, retrieved 2026-10-10. North and North Coast = Monterey County north; South Coast = San Luis Obispo County south; Interior Valleys = Sacramento, San Joaquin, and similar valleys; Desert Valleys = Imperial and Coachella Valleys. Source line on the page: California Master Gardener Handbook, Table 13.2, Adapted from Vegetable Gardening Illustrated 1994.

Crop

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