Last frost date in Niles, IL
The average last frost in Niles is April 16. By May 1 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 28, which leaves 193 frost-free days. An early freeze before October 15 happens one year in ten.
- Safe after (10% risk)
- May 1
- Average first frost
- Oct 28
- Frost-free season
- 193 days
- Hard freeze (28°F) ends
- Apr 5
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2249°
- FriOct 2351°
- SatOct 2452°
- SunOct 2553°
- MonOct 2650°
- TueOct 2747°
- WedOct 2848°
Planting calendar for Niles
Windows count forward or back from the average frost dates above. Click a crop for dates across Illinois.
TomatoesApr 23–May 7
PumpkinsApr 30–May 14
SunflowersApr 16–May 7
CucumbersApr 30–May 7
CornApr 23–May 7
Sweet potatoesMay 7–May 21
WatermelonApr 30–May 14
Green beansApr 23–May 14
ZucchiniApr 23–May 7
OkraMay 7–May 21
PeppersApr 30–May 14
BasilApr 23–May 7
Butternut squashApr 23–May 7
CantaloupeApr 30–May 14
EggplantApr 30–May 14
PotatoesMar 19–Apr 2
OnionsMar 5–Mar 26
CarrotsMar 26–Apr 30
LettuceApr 2–Apr 23
BroccoliMar 19–Apr 2
BeetsMar 19–Apr 30
PeasMar 5–Mar 19
CabbageMar 19–Apr 2
RadishesMar 12–Apr 23
Brussels sproutsApr 2–Apr 16
SpinachMar 5–Mar 26
CilantroApr 2–Apr 23
KaleMar 19–Apr 2
Collard greensMar 19–Apr 2
TurnipsMar 19–Apr 2
DillApr 16–Apr 30
CeleryApr 23–Apr 30
CauliflowerApr 2–Apr 16
LeeksApr 2–Apr 16
Swiss chardApr 2–Apr 30
ParsleyApr 2–Apr 23
Tulip bulbsOct 14–Nov 18
GarlicOct 7–Nov 11
Daffodil bulbsSep 30–Nov 11
StrawberriesMar 19–Apr 2
AsparagusMar 19–Apr 2Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 3 | Apr 16 | May 1 | Oct 15 | Oct 28 | Nov 11 |
| Hard freeze, 28°F | Mar 21 | Apr 5 | Apr 19 | Oct 27 | Nov 7 | Nov 22 |
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 Ohare International Airport (USW00094846) sits 6.7 miles from the center of Niles at 658 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 Niles, IL?
The average last frost date in Niles is April 16, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 1.
When is the first frost in Niles?
The first frost in fall usually comes around October 28. One year in ten it arrives before October 15.
How long is the growing season in Niles?
About 193 days between the average last and first frost.
When should I plant tomatoes in Niles?
Plant tomato seedlings outside from April 23 to May 7. Start seeds indoors six to eight weeks earlier.
Nearby in Illinois
- Morton GroveApr 26
- Park RidgeApr 16
- SkokieApr 26
- GlenviewApr 26
- Des PlainesApr 16
- WilmetteApr 26
- EvanstonApr 26
- Mount ProspectApr 19
- NorthbrookApr 26
- Elmwood ParkApr 16
- Melrose ParkApr 16
- WheelingApr 19