Last frost date in Casas Adobes, AZ

Average last frost
February 26

Expect the last frost in Casas Adobes around February 26. Frost after March 18 happens in only one year out of ten. The first fall frost usually arrives about December 4, which leaves 279 frost-free days. An early freeze before November 17 happens one year in ten.

Safe after (10% risk)
Mar 18
Average first frost
Dec 4
Frost-free season
279 days
Hard freeze (28°F) ends
Feb 1
Next 6 nights in Casas Adobes

No frost in the next 6 nights

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

  1. ThuOct 2260°
  2. FriOct 2358°
  3. SatOct 2457°
  4. SunOct 2558°
  5. MonOct 2660°
  6. TueOct 2761°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Feb 26First frost Dec 4279 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND279 frost-free days
Frost risk through the year at Tohono Chul, 1.8 miles from Casas Adobes.

Planting calendar for Casas Adobes

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMar 5–Mar 19
PumpkinsMar 12–Mar 26
SunflowersFeb 26–Mar 19
CucumbersMar 12–Mar 19
CornMar 5–Mar 19
Sweet potatoesMar 19–Apr 2
WatermelonMar 12–Mar 26
Green beansMar 5–Mar 26
ZucchiniMar 5–Mar 19
OkraMar 19–Apr 2
PeppersMar 12–Mar 26
BasilMar 5–Mar 19
Butternut squashMar 5–Mar 19
CantaloupeMar 12–Mar 26
EggplantMar 12–Mar 26
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesJan 29–Feb 12
OnionsJan 15–Feb 5
CarrotsFeb 5–Mar 12
LettuceFeb 12–Mar 5
BroccoliJan 29–Feb 12
BeetsJan 29–Mar 12
PeasJan 15–Jan 29
CabbageJan 29–Feb 12
RadishesJan 22–Mar 5
Brussels sproutsFeb 12–Feb 26
SpinachJan 15–Feb 5
CilantroFeb 12–Mar 5
KaleJan 29–Feb 12
Collard greensJan 29–Feb 12
TurnipsJan 29–Feb 12
DillFeb 26–Mar 12
CeleryMar 5–Mar 12
CauliflowerFeb 12–Feb 26
LeeksFeb 12–Feb 26
Swiss chardFeb 12–Mar 12
ParsleyFeb 12–Mar 5
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesJan 29–Feb 12
AsparagusJan 29–Feb 12

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FJan 29Feb 26Mar 18Nov 17Dec 4Dec 19
Hard freeze, 28°FDec 31Feb 1Feb 27Nov 30Dec 17Jan 16

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 Tohono Chul (USC00028590) sits 1.8 miles from the center of Casas Adobes at 2,527 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 Casas Adobes, AZ?

The average last frost date in Casas Adobes is February 26, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after March 18.

When is the first frost in Casas Adobes?

The first frost in fall usually comes around December 4. One year in ten it arrives before November 17.

How long is the growing season in Casas Adobes?

About 279 days between the average last and first frost.

When should I plant tomatoes in Casas Adobes?

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

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