Last frost date in Millbrae, CA

Average last frost
December 29

In Millbrae, the last spring frost comes around December 29 in an average year. Wait until January 13 if you want 90% odds of no more frost. The first fall frost usually arrives about December 26, which leaves 365 frost-free days. An early freeze before December 11 happens one year in ten.

Safe after (10% risk)
Jan 13
Average first frost
Dec 26
Frost-free season
365 days
Hard freeze (28°F) ends
rare
Next 6 nights in Millbrae

No frost in the next 6 nights

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

  1. ThuOct 2254°
  2. FriOct 2350°
  3. SatOct 2451°
  4. SunOct 2554°
  5. MonOct 2653°
  6. TueOct 2753°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Dec 29First frost Dec 26365 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND365 frost-free days
Frost risk through the year at San Francisco International Airport, 2.5 miles from Millbrae.

Planting calendar for Millbrae

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
TomatoesJan 5–Jan 19
PumpkinsJan 12–Jan 26
SunflowersDec 29–Jan 19
CucumbersJan 12–Jan 19
CornJan 5–Jan 19
Sweet potatoesJan 19–Feb 2
WatermelonJan 12–Jan 26
Green beansJan 5–Jan 26
ZucchiniJan 5–Jan 19
OkraJan 19–Feb 2
PeppersJan 12–Jan 26
BasilJan 5–Jan 19
Butternut squashJan 5–Jan 19
CantaloupeJan 12–Jan 26
EggplantJan 12–Jan 26
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesDec 1–Dec 15
OnionsNov 17–Dec 8
CarrotsDec 8–Jan 12
LettuceDec 15–Jan 5
BroccoliDec 1–Dec 15
BeetsDec 1–Jan 12
PeasNov 17–Dec 1
CabbageDec 1–Dec 15
RadishesNov 24–Jan 5
Brussels sproutsDec 15–Dec 29
SpinachNov 17–Dec 8
CilantroDec 15–Jan 5
KaleDec 1–Dec 15
Collard greensDec 1–Dec 15
TurnipsDec 1–Dec 15
DillDec 29–Jan 12
CeleryJan 5–Jan 12
CauliflowerDec 15–Dec 29
LeeksDec 15–Dec 29
Swiss chardDec 15–Jan 12
ParsleyDec 15–Jan 5
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesDec 1–Dec 15
AsparagusDec 1–Dec 15

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FDec 11Dec 29Jan 13Dec 11Dec 26Jan 13

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 Francisco International Airport (USW00023234) sits 2.5 miles from the center of Millbrae at 8 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 Millbrae, CA?

The average last frost date in Millbrae is December 29, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after January 13.

When is the first frost in Millbrae?

The first frost in fall usually comes around December 26. One year in ten it arrives before December 11.

How long is the growing season in Millbrae?

About 365 days between the average last and first frost.

When should I plant tomatoes in Millbrae?

Plant tomato seedlings outside from January 5 to January 19. Start seeds indoors six to eight weeks earlier.

Nearby in California

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