Last frost date in Alhambra, CA

Average last frost
January 4

Expect the last frost in Alhambra around January 4. Frost after January 28 happens in only one year out of ten. The first fall frost usually arrives about January 2, which leaves 365 frost-free days. An early freeze before December 18 happens one year in ten.

Safe after (10% risk)
Jan 28
Average first frost
Jan 2
Frost-free season
365 days
Hard freeze (28°F) ends
rare
Next 6 nights in Alhambra

No frost in the next 6 nights

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

  1. ThuOct 2254°
  2. FriOct 2354°
  3. SatOct 2457°
  4. SunOct 2559°
  5. MonOct 2659°
  6. TueOct 2759°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Jan 4First frost Jan 2365 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND365 frost-free days
Frost risk through the year at San Gabriel Fire Dept, 2.1 miles from Alhambra.

Planting calendar for Alhambra

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 7–Dec 21
OnionsNov 23–Dec 14
CarrotsDec 14–Jan 18
LettuceDec 21–Jan 11
BroccoliDec 7–Dec 21
BeetsDec 7–Jan 18
PeasNov 23–Dec 7
CabbageDec 7–Dec 21
RadishesNov 30–Jan 11
Brussels sproutsDec 21–Jan 4
SpinachNov 23–Dec 14
CilantroDec 21–Jan 11
KaleDec 7–Dec 21
Collard greensDec 7–Dec 21
TurnipsDec 7–Dec 21
DillJan 4–Jan 18
CeleryJan 11–Jan 18
CauliflowerDec 21–Jan 4
LeeksDec 21–Jan 4
Swiss chardDec 21–Jan 18
ParsleyDec 21–Jan 11
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesDec 7–Dec 21
AsparagusDec 7–Dec 21

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FDec 19Jan 4Jan 28Dec 18Jan 2Jan 26

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 San Gabriel Fire Dept (USC00047785) sits 2.1 miles from the center of Alhambra at 363 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 Alhambra, CA?

The average last frost date in Alhambra is January 4, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after January 28.

When is the first frost in Alhambra?

The first frost in fall usually comes around January 2. One year in ten it arrives before December 18.

How long is the growing season in Alhambra?

About 365 days between the average last and first frost.

When should I plant tomatoes in Alhambra?

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

Nearby in California

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