Last frost date in Stevenson Ranch, CA

Average last frost
January 8

Expect the last frost in Stevenson Ranch around January 8. Frost after March 10 happens in only one year out of ten. The first fall frost usually arrives about January 1, which leaves 365 frost-free days. An early freeze before November 30 happens one year in ten.

Safe after (10% risk)
Mar 10
Average first frost
Jan 1
Frost-free season
365 days
Hard freeze (28°F) ends
rare
Next 6 nights in Stevenson Ranch

No frost in the next 6 nights

National Weather Service forecast, updated Oct 22, 12:57 UTC

  1. ThuOct 2249°
  2. FriOct 2350°
  3. SatOct 2450°
  4. SunOct 2551°
  5. MonOct 2651°
  6. TueOct 2751°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Jan 8First frost Jan 1365 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND365 frost-free days
Frost risk through the year at Newhall 5NW, 0.7 miles from Stevenson Ranch.

Planting calendar for Stevenson Ranch

Windows count forward or back from the average frost dates above. Click a crop for dates across California.

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesFeb 15–Mar 1
PumpkinsFeb 15–Mar 1
SunflowersFeb 15–Mar 8
CucumbersFeb 22–Mar 1
CornFeb 15–Mar 1
Sweet potatoesFeb 15–Mar 1
WatermelonFeb 15–Mar 1
Green beansFeb 15–Mar 8
ZucchiniFeb 15–Mar 1
OkraFeb 15–Mar 1
PeppersFeb 15–Mar 1
BasilFeb 15–Mar 1
Butternut squashFeb 15–Mar 1
CantaloupeFeb 15–Mar 1
EggplantFeb 15–Mar 1
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesDec 11–Dec 25
OnionsNov 27–Dec 18
CarrotsDec 18–Jan 22
LettuceDec 25–Jan 15
BroccoliDec 11–Dec 25
BeetsDec 11–Jan 22
PeasNov 27–Dec 11
CabbageDec 11–Dec 25
RadishesDec 4–Jan 15
Brussels sproutsDec 25–Jan 8
SpinachNov 27–Dec 18
CilantroDec 25–Jan 15
KaleDec 11–Dec 25
Collard greensDec 11–Dec 25
TurnipsDec 11–Dec 25
DillJan 8–Jan 22
CeleryJan 15–Jan 22
CauliflowerDec 25–Jan 8
LeeksDec 25–Jan 8
Swiss chardDec 25–Jan 22
ParsleyDec 25–Jan 15
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesDec 11–Dec 25
AsparagusDec 11–Dec 25

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FDec 8Jan 8Mar 10Nov 30Jan 1Feb 25

Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.

Where these numbers come from

NOAA station Newhall 5NW (USC00046161) sits 0.7 miles from the center of Stevenson Ranch at 1,765 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.

Questions

When is the last frost in Stevenson Ranch, CA?

The average last frost date in Stevenson Ranch is January 8, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after March 10.

When is the first frost in Stevenson Ranch?

The first frost in fall usually comes around January 1. One year in ten it arrives before November 30.

How long is the growing season in Stevenson Ranch?

About 365 days between the average last and first frost.

When should I plant tomatoes in Stevenson Ranch?

Plant tomato seedlings outside from February 15 to March 1. Start seeds indoors six to eight weeks earlier.

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