Last frost date in Olathe, KS

Average last frost
April 10

The average last frost in Olathe is April 10. By April 24 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 29, which leaves 202 frost-free days. An early freeze before October 13 happens one year in ten.

Safe after (10% risk)
Apr 24
Average first frost
Oct 29
Frost-free season
202 days
Hard freeze (28°F) ends
Mar 31
Next 7 nights in Olathe

No frost in the next 7 nights

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

  1. ThuOct 2254°
  2. FriOct 2356°
  3. SatOct 2455°
  4. SunOct 2556°
  5. MonOct 2651°
  6. TueOct 2747°
  7. WedOct 2850°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 10First frost Oct 29202 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND202 frost-free days
Frost risk through the year at Olathe 3E, 3.2 miles from Olathe.

Planting calendar for Olathe

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesApr 17–May 1
PumpkinsApr 24–May 8
SunflowersApr 10–May 1
CucumbersApr 24–May 1
CornApr 17–May 1
Sweet potatoesMay 1–May 15
WatermelonApr 24–May 8
Green beansApr 17–May 8
ZucchiniApr 17–May 1
OkraMay 1–May 15
PeppersApr 24–May 8
BasilApr 17–May 1
Butternut squashApr 17–May 1
CantaloupeApr 24–May 8
EggplantApr 24–May 8
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 13–Mar 27
OnionsFeb 27–Mar 20
CarrotsMar 20–Apr 24
LettuceMar 27–Apr 17
BroccoliMar 13–Mar 27
BeetsMar 13–Apr 24
PeasFeb 27–Mar 13
CabbageMar 13–Mar 27
RadishesMar 6–Apr 17
Brussels sproutsMar 27–Apr 10
SpinachFeb 27–Mar 20
CilantroMar 27–Apr 17
KaleMar 13–Mar 27
Collard greensMar 13–Mar 27
TurnipsMar 13–Mar 27
DillApr 10–Apr 24
CeleryApr 17–Apr 24
CauliflowerMar 27–Apr 10
LeeksMar 27–Apr 10
Swiss chardMar 27–Apr 24
ParsleyMar 27–Apr 17
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 15–Nov 19
GarlicOct 8–Nov 12
Daffodil bulbsOct 1–Nov 12
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 13–Mar 27
AsparagusMar 13–Mar 27

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FMar 27Apr 10Apr 24Oct 13Oct 29Nov 12
Hard freeze, 28°FMar 13Mar 31Apr 17Oct 23Nov 6Nov 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 Olathe 3E (USC00145972) sits 3.2 miles from the center of Olathe at 1,055 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 Olathe, KS?

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

When is the first frost in Olathe?

The first frost in fall usually comes around October 29. One year in ten it arrives before October 13.

How long is the growing season in Olathe?

About 202 days between the average last and first frost.

When should I plant tomatoes in Olathe?

Plant tomato seedlings outside from April 17 to May 1. Start seeds indoors six to eight weeks earlier.

Nearby in Kansas

All 22 cities in Kansas