When is the last frost in Addison, IL?

The average last spring frost (50% probability of 32°F) in Addison is around April 16, based on NOAA/NCEI 1991–2020 normals at the Chicago Ohare Intl Ap, IL station (5.9 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Addison?

The average first fall frost in Addison, IL is around October 28, giving roughly a 193-day frost-free growing season.

What planting zone is Addison, IL?

Addison is in USDA plant hardiness zone 6a (average annual extreme minimum temperature -10 to -5°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Addison?

In Addison, IL the warmest month is July (avg high 84.5°F) and the coldest is January (avg low 18.8°F). It averages about 37.9″ of precipitation a year and 38.4″ of snow.

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Addison, IL Planting Calendar & Frost Dates

USDA hardiness zone 6a · ZIP 60101 · elevation 201′ · NOAA & USDA data

Addison is in USDA hardiness zone 6a (winters can dip to -10 to -5°F), with a growing season of about 193 days between the average last spring frost (April 16) and first fall frost (October 28). The warmest month is July (avg high 84.5°F); the coldest is January (avg low 18.8°F). It averages 37.9″ of precipitation a year and 38.4″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp -10 to -5°F

Last spring frost

April 16

avg (50% prob, 32°F)

First fall frost

October 28

avg (50% prob, 32°F)

Growing season

193 days

frost-free window

Warmest month

July

avg high 84.5°F

Month-by-month typical weather in Addison

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Chicago Ohare Intl Ap, IL (5.9 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	31.6	18.8	25.2	2	11.3
February	35.7	21.8	28.8	2	10.7
March	47	31	39	2.5	5.5
April	59	40.3	49.7	3.8	1.3
May	70.5	50.6	60.6	4.5	0
June	80.4	60.8	70.6	4.1	0
July	84.5	66.4	75.4	3.7	0
August	82.5	65.1	73.8	4.3	0
September	75.5	57.1	66.3	3.2	0
October	62.7	45.4	54	3.4	0.2
November	48.4	34.1	41.3	2.4	1.8
December	36.6	24.4	30.5	2.1	7.6

What to plant when in Addison

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 5 · Transplant out: April 23
Peppers	warm	Start seeds indoors: February 19 · Transplant out: April 30
Cucumbers	warm	Direct sow: April 23
Zucchini / squash	warm	Direct sow: April 23
Bush beans	warm	Direct sow: April 23
Sweet corn	warm	Direct sow: April 23
Basil	warm	Transplant out: April 23
Peas	cool	Sow (spring): March 12 · Sow (fall): September 2
Spinach	cool	Sow (spring): March 5 · Sow (fall): September 2
Lettuce	cool	Sow (spring): March 19 · Sow (fall): September 2
Kale	cool	Transplant (spring): March 26 · Sow (fall): August 19
Broccoli	cool	Transplant (spring): April 2
Carrots	cool	Sow (spring): March 26 · Sow (fall): August 19
Onions	cool	Transplant (spring): March 19
Potatoes	cool	Plant seed potatoes: April 2
Radishes	cool	Sow (spring): March 19 · Sow (fall): September 16

Dates are computed from Addison's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in Illinois

Lombard, IL Elmhurst, IL Carol Stream, IL Wheaton, IL Hanover Park, IL Downers Grove, IL Schaumburg, IL Mount Prospect, IL

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Chicago Ohare Intl Ap, IL, 5.9 mi (confidence: high). Monthly weather normals: Chicago Ohare Intl Ap, IL, 5.9 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.