When to plant in Lemont, IL
Planting dates worked out from Lemont's own frost records, not a generic zone chart.
Safe to plant out
May 3
1 year in 10 has a later frost
Average last frost
Apr 20
about a 50% chance of a later one
Average first fall frost
Oct 18
1 year in 10 by Oct 5
Frost-free days
180
median, 1991–2020
Station used: Romeoville Wfo · 10.4 km away · station 201 m, town 185 m. How we match towns to stations
This season
Plan your garden.
Planting dates for common crops
| Crop | Start indoors | Plant out or sow | Harvest from |
|---|---|---|---|
| Tomato | Mar 8 – Mar 22 | May 3 – May 17 | Jun 27 |
| Sweet pepper | Feb 22 – Mar 8 | May 3 – May 17 | Jul 2 |
| Lettuce (leaf) | Feb 19 – Feb 26 | Mar 26 – Apr 9 | May 5 |
| Peas | — | Mar 26 – Apr 23 | May 20 |
| Bush beans | — | Apr 26 – May 17 | Jun 15 |
| Carrot | — | Apr 3 – May 15 | Jun 2 |
| Beet | — | Apr 3 – May 15 | May 23 |
| Potato | — | Apr 3 – Apr 24 | Jun 12 |
| Kale | Feb 19 – Mar 5 | Apr 2 – Apr 16 | May 15 |
| Broccoli | Feb 12 – Feb 26 | Mar 26 – Apr 16 | May 25 |
| Cucumber | Apr 5 – Apr 12 | May 3 – May 17 | Jun 22 |
| Summer squash and zucchini | Apr 5 – Apr 12 | May 3 – May 17 | Jun 17 |
| Winter squash | Apr 5 – Apr 12 | May 3 – May 17 | Jul 22 |
| Sweet corn | — | Apr 26 – May 17 | Jun 25 |
| Onion (from sets) | — | Mar 26 – Apr 16 | Jun 24 |
| Garlic | — | Oct 4 – Nov 1 (fall) | following summer |
| Spinach | — | Mar 26 – Apr 23 | May 3 |
| Basil | Mar 22 – Apr 5 | May 3 – May 17 | Jun 29 |
Lemont's weather over time
How the growing season has shifted here, year by year, from the station's own records.
Each year's last spring frostLong-term trend
See the data as a table
| Year | Last spring frost |
|---|---|
| 1998 | Apr 17 |
| 1999 | Mar 29 |
| 2000 | Apr 12 |
| 2001 | Apr 18 |
| 2002 | May 21 |
| 2003 | Apr 23 |
| 2004 | May 3 |
| 2005 | May 3 |
| 2006 | Apr 9 |
| 2007 | Apr 16 |
| 2008 | Apr 29 |
| 2009 | Apr 12 |
| 2010 | Apr 9 |
| 2011 | Apr 21 |
| 2012 | Apr 12 |
| 2013 | Apr 21 |
| 2014 | Apr 16 |
| 2015 | Apr 24 |
| 2016 | Apr 12 |
| 2017 | Apr 7 |
| 2018 | Apr 29 |
| 2019 | Apr 28 |
| 2020 | May 9 |
| 2021 | Apr 22 |
| 2022 | Apr 27 |
| 2023 | Apr 26 |
| 2024 | Apr 25 |
| 2025 | Apr 16 |
| 2026 | May 2 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1998 | 187 |
| 1999 | 202 |
| 2000 | 177 |
| 2001 | 170 |
| 2002 | 145 |
| 2003 | 160 |
| 2004 | 154 |
| 2005 | 172 |
| 2006 | 185 |
| 2007 | 194 |
| 2008 | 180 |
| 2009 | 180 |
| 2010 | 202 |
| 2011 | 190 |
| 2012 | 176 |
| 2013 | 182 |
| 2014 | 185 |
| 2015 | 175 |
| 2016 | 213 |
| 2017 | 212 |
| 2018 | 165 |
| 2019 | 184 |
| 2020 | 148 |
| 2021 | 192 |
| 2022 | 163 |
| 2023 | 186 |
| 2024 | 208 |
| 2025 | 190 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1998 | 19.8 °C |
| 1999 | 19.2 °C |
| 2000 | 18.3 °C |
| 2001 | 18.9 °C |
| 2002 | 19.1 °C |
| 2003 | 17.7 °C |
| 2004 | 18.1 °C |
| 2005 | 19.9 °C |
| 2006 | 18.8 °C |
| 2007 | 19.4 °C |
| 2008 | 18.4 °C |
| 2009 | 17.7 °C |
| 2010 | 20.2 °C |
| 2011 | 18.8 °C |
| 2012 | 19.9 °C |
| 2013 | 18.6 °C |
| 2014 | 18.0 °C |
| 2015 | 18.6 °C |
| 2016 | 19.4 °C |
| 2017 | 18.9 °C |
| 2018 | 19.1 °C |
| 2019 | 19.2 °C |
| 2020 | 18.9 °C |
| 2021 | 19.6 °C |
| 2022 | 18.7 °C |
| 2023 | 18.8 °C |
| 2024 | 19.9 °C |
| 2025 | 19.1 °C |
| 2026 | 19.5 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from Romeoville Wfo (NOAA GHCN-Daily). Years with too many missing days are left out.