Last frost date in Oak Park, IL
In Oak Park, the last spring frost comes around April 11 in an average year. Wait until April 27 if you want 90% odds of no more frost. The first fall frost usually arrives about October 31, which leaves 201 frost-free days. An early freeze before October 20 happens one year in ten.
- Safe after (10% risk)
- Apr 27
- Average first frost
- Oct 31
- Frost-free season
- 201 days
- Hard freeze (28°F) ends
- Apr 1
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2250°
- FriOct 2351°
- SatOct 2453°
- SunOct 2554°
- MonOct 2651°
- TueOct 2748°
- WedOct 2848°
Planting calendar for Oak Park
Windows count forward or back from the average frost dates above. Click a crop for dates across Illinois.
TomatoesApr 18–May 2
PumpkinsApr 25–May 9
SunflowersApr 11–May 2
CucumbersApr 25–May 2
CornApr 18–May 2
Sweet potatoesMay 2–May 16
WatermelonApr 25–May 9
Green beansApr 18–May 9
ZucchiniApr 18–May 2
OkraMay 2–May 16
PeppersApr 25–May 9
BasilApr 18–May 2
Butternut squashApr 18–May 2
CantaloupeApr 25–May 9
EggplantApr 25–May 9
PotatoesMar 14–Mar 28
OnionsFeb 28–Mar 21
CarrotsMar 21–Apr 25
LettuceMar 28–Apr 18
BroccoliMar 14–Mar 28
BeetsMar 14–Apr 25
PeasFeb 28–Mar 14
CabbageMar 14–Mar 28
RadishesMar 7–Apr 18
Brussels sproutsMar 28–Apr 11
SpinachFeb 28–Mar 21
CilantroMar 28–Apr 18
KaleMar 14–Mar 28
Collard greensMar 14–Mar 28
TurnipsMar 14–Mar 28
DillApr 11–Apr 25
CeleryApr 18–Apr 25
CauliflowerMar 28–Apr 11
LeeksMar 28–Apr 11
Swiss chardMar 28–Apr 25
ParsleyMar 28–Apr 18
Tulip bulbsOct 17–Nov 21
GarlicOct 10–Nov 14
Daffodil bulbsOct 3–Nov 14
StrawberriesMar 14–Mar 28
AsparagusMar 14–Mar 28Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Mar 30 | Apr 11 | Apr 27 | Oct 20 | Oct 31 | Nov 14 |
| Hard freeze, 28°F | Mar 15 | Apr 1 | Apr 14 | Oct 31 | Nov 11 | Nov 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 Chicago Midway Airport (USW00014819) sits 7.2 miles from the center of Oak Park at 612 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 Oak Park, IL?
The average last frost date in Oak Park is April 11, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 27.
When is the first frost in Oak Park?
The first frost in fall usually comes around October 31. One year in ten it arrives before October 20.
How long is the growing season in Oak Park?
About 201 days between the average last and first frost.
When should I plant tomatoes in Oak Park?
Plant tomato seedlings outside from April 18 to May 2. Start seeds indoors six to eight weeks earlier.
Nearby in Illinois
- Elmwood ParkApr 16
- MaywoodApr 11
- BerwynApr 11
- CiceroApr 11
- Melrose ParkApr 16
- ChicagoApr 10
- ElmhurstApr 16
- Park RidgeApr 16
- Villa ParkApr 28
- NilesApr 16
- BurbankApr 10
- SkokieApr 26