Last frost date in Yorkville, IL
In Yorkville, the last spring frost comes around April 28 in an average year. Wait until May 11 if you want 90% odds of no more frost. The first fall frost usually arrives about October 13, which leaves 166 frost-free days. An early freeze before September 27 happens one year in ten.
- Safe after (10% risk)
- May 11
- Average first frost
- Oct 13
- Frost-free season
- 166 days
- Hard freeze (28°F) ends
- Apr 18
No frost in the next 7 nights
Later than usual: the average first frost here is October 13.
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2245°
- FriOct 2346°
- SatOct 2448°
- SunOct 2549°
- MonOct 2648°
- TueOct 2744°
- WedOct 2844°
Planting calendar for Yorkville
Windows count forward or back from the average frost dates above. Click a crop for dates across Illinois.
TomatoesMay 5–May 19
PumpkinsMay 12–May 26
SunflowersApr 28–May 19
CucumbersMay 12–May 19
CornMay 5–May 19
Sweet potatoesMay 19–Jun 2
WatermelonMay 12–May 26
Green beansMay 5–May 26
ZucchiniMay 5–May 19
OkraMay 19–Jun 2
PeppersMay 12–May 26
BasilMay 5–May 19
Butternut squashMay 5–May 19
CantaloupeMay 12–May 26
EggplantMay 12–May 26
PotatoesMar 31–Apr 14
OnionsMar 17–Apr 7
CarrotsApr 7–May 12
LettuceApr 14–May 5
BroccoliMar 31–Apr 14
BeetsMar 31–May 12
PeasMar 17–Mar 31
CabbageMar 31–Apr 14
RadishesMar 24–May 5
Brussels sproutsApr 14–Apr 28
SpinachMar 17–Apr 7
CilantroApr 14–May 5
KaleMar 31–Apr 14
Collard greensMar 31–Apr 14
TurnipsMar 31–Apr 14
DillApr 28–May 12
CeleryMay 5–May 12
CauliflowerApr 14–Apr 28
LeeksApr 14–Apr 28
Swiss chardApr 14–May 12
ParsleyApr 14–May 5
Tulip bulbsSep 29–Nov 3
GarlicSep 22–Oct 27
Daffodil bulbsSep 15–Oct 27
StrawberriesMar 31–Apr 14
AsparagusMar 31–Apr 14Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 14 | Apr 28 | May 11 | Sep 27 | Oct 13 | Oct 24 |
| Hard freeze, 28°F | Apr 3 | Apr 18 | May 4 | Oct 6 | Oct 23 | Nov 4 |
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 Aurora Municipal Airport (USW00004808) sits 8.0 miles from the center of Yorkville at 710 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 Yorkville, IL?
The average last frost date in Yorkville is April 28, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 11.
When is the first frost in Yorkville?
The first frost in fall usually comes around October 13. One year in ten it arrives before September 27.
How long is the growing season in Yorkville?
About 166 days between the average last and first frost.
When should I plant tomatoes in Yorkville?
Plant tomato seedlings outside from May 5 to May 19. Start seeds indoors six to eight weeks earlier.
Nearby in Illinois
- OswegoApr 19
- MontgomeryApr 19
- AuroraApr 19
- PlainfieldApr 20
- BataviaApr 19
- NapervilleApr 28
- GenevaApr 25
- BolingbrookApr 20
- RomeovilleApr 20
- Crest HillApr 20
- JolietApr 19
- St. CharlesApr 25