Last frost date in Oak Lawn, IL
The average last frost in Oak Lawn is April 10. By April 26 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about November 1, which leaves 203 frost-free days. An early freeze before October 21 happens one year in ten.
- Safe after (10% risk)
- Apr 26
- Average first frost
- Nov 1
- Frost-free season
- 203 days
- Hard freeze (28°F) ends
- Apr 1
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:24 UTC
- ThuOct 2250°
- FriOct 2351°
- SatOct 2452°
- SunOct 2553°
- MonOct 2650°
- TueOct 2748°
- WedOct 2848°
Planting calendar for Oak Lawn
Windows count forward or back from the average frost dates above. Click a crop for dates across Illinois.
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
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
Tulip bulbsOct 18–Nov 22
GarlicOct 11–Nov 15
Daffodil bulbsOct 4–Nov 15
StrawberriesMar 13–Mar 27
AsparagusMar 13–Mar 27Frost 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 10 | Apr 26 | Oct 21 | Nov 1 | Nov 16 |
| Hard freeze, 28°F | Mar 15 | Apr 1 | Apr 14 | Oct 30 | 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 3SW (USC00111577) sits 2.1 miles from the center of Oak Lawn at 620 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 Lawn, IL?
The average last frost date in Oak Lawn is April 10, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 26.
When is the first frost in Oak Lawn?
The first frost in fall usually comes around November 1. One year in ten it arrives before October 21.
How long is the growing season in Oak Lawn?
About 203 days between the average last and first frost.
When should I plant tomatoes in Oak Lawn?
Plant tomato seedlings outside from April 17 to May 1. Start seeds indoors six to eight weeks earlier.
Nearby in Illinois
- BurbankApr 10
- Blue IslandApr 10
- Oak ForestApr 23
- CiceroApr 11
- Orland ParkApr 19
- BerwynApr 11
- ChicagoApr 10
- DoltonApr 23
- Tinley ParkApr 23
- South HollandApr 23
- DarienApr 19
- Oak ParkApr 11