Last frost date in Meridian, ID

Average last frost
April 24

Expect the last frost in Meridian around April 24. Frost after May 9 happens in only one year out of ten. The first fall frost usually arrives about October 21, which leaves 179 frost-free days. An early freeze before October 5 happens one year in ten.

Safe after (10% risk)
May 9
Average first frost
Oct 21
Frost-free season
179 days
Hard freeze (28°F) ends
Apr 2
Next 7 nights in Meridian

Frost possible in low spots Fri night, low 34°F

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

  1. ThuOct 2245°
  2. FriOct 2334°possible frost
  3. SatOct 2435°possible frost
  4. SunOct 2537°
  5. MonOct 2636°possible frost
  6. TueOct 2736°possible frost
  7. WedOct 2836°possible frost
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 24First frost Oct 21179 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND179 frost-free days
Frost risk through the year at Boise Air Terminal, 8.6 miles from Meridian.

Planting calendar for Meridian

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMay 1–May 15
PumpkinsMay 8–May 22
SunflowersApr 24–May 15
CucumbersMay 8–May 15
CornMay 1–May 15
Sweet potatoesMay 15–May 29
WatermelonMay 8–May 22
Green beansMay 1–May 22
ZucchiniMay 1–May 15
OkraMay 15–May 29
PeppersMay 8–May 22
BasilMay 1–May 15
Butternut squashMay 1–May 15
CantaloupeMay 8–May 22
EggplantMay 8–May 22
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 27–Apr 10
OnionsMar 13–Apr 3
CarrotsApr 3–May 8
LettuceApr 10–May 1
BroccoliMar 27–Apr 10
BeetsMar 27–May 8
PeasMar 13–Mar 27
CabbageMar 27–Apr 10
RadishesMar 20–May 1
Brussels sproutsApr 10–Apr 24
SpinachMar 13–Apr 3
CilantroApr 10–May 1
KaleMar 27–Apr 10
Collard greensMar 27–Apr 10
TurnipsMar 27–Apr 10
DillApr 24–May 8
CeleryMay 1–May 8
CauliflowerApr 10–Apr 24
LeeksApr 10–Apr 24
Swiss chardApr 10–May 8
ParsleyApr 10–May 1
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 7–Nov 11
GarlicSep 30–Nov 4
Daffodil bulbsSep 23–Nov 4
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 27–Apr 10
AsparagusMar 27–Apr 10

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 4Apr 24May 9Oct 5Oct 21Nov 5
Hard freeze, 28°FMar 10Apr 2Apr 25Oct 17Oct 31Nov 19

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 Boise Air Terminal (USW00024131) sits 8.6 miles from the center of Meridian at 2,814 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 Meridian, ID?

The average last frost date in Meridian is April 24, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 9.

When is the first frost in Meridian?

The first frost in fall usually comes around October 21. One year in ten it arrives before October 5.

How long is the growing season in Meridian?

About 179 days between the average last and first frost.

When should I plant tomatoes in Meridian?

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

Nearby in Idaho

All 16 cities in Idaho