When is the last frost in Palatine, IL?

The average last spring frost (50% probability of 32°F) in Palatine is around April 25, based on NOAA/NCEI 1991–2020 normals at the Barrington 3sw, IL station (5.1 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 Palatine?

The average first fall frost in Palatine, IL is around October 19, giving roughly a 177-day frost-free growing season.

What planting zone is Palatine, IL?

Palatine is in USDA plant hardiness zone 5b (average annual extreme minimum temperature -15 to -10°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Palatine?

In Palatine, IL the warmest month is July (avg high 81.3°F) and the coldest is January (avg low 13.4°F). It averages about 40.4″ of precipitation a year and 38.5″ of snow.

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Palatine, IL Planting Calendar & Frost Dates

USDA hardiness zone 5b · ZIP 60067 · elevation 267′ · NOAA & USDA data

Palatine is in USDA hardiness zone 5b (winters can dip to -15 to -10°F), with a growing season of about 177 days between the average last spring frost (April 25) and first fall frost (October 19). The warmest month is July (avg high 81.3°F); the coldest is January (avg low 13.4°F). It averages 40.4″ of precipitation a year and 38.5″ 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 -15 to -10°F

Last spring frost

April 25

avg (50% prob, 32°F)

First fall frost

October 19

avg (50% prob, 32°F)

Growing season

177 days

frost-free window

Warmest month

July

avg high 81.3°F

Month-by-month typical weather in Palatine

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Barrington 3sw, IL (5.1 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	28.7	13.4	21.1	2.1	12.6
February	32.8	16.4	24.6	1.9	8.5
March	44.5	26.5	35.5	2.4	4.6
April	57.5	37.2	47.3	4	1.1
May	68.5	48.3	58.4	5.2	0
June	77.5	58.1	67.8	4.6	0
July	81.3	62.6	72	4	0
August	79.2	61.2	70.2	4.6	0
September	72.4	53.6	63	3.7	0
October	60.1	41.5	50.8	3.4	0.1
November	46.3	30.2	38.2	2.6	2
December	34.2	19.7	27	2.2	9.6

What to plant when in Palatine

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 14 · Transplant out: May 2
Peppers	warm	Start seeds indoors: February 28 · Transplant out: May 9
Cucumbers	warm	Direct sow: May 2
Zucchini / squash	warm	Direct sow: May 2
Bush beans	warm	Direct sow: May 2
Sweet corn	warm	Direct sow: May 2
Basil	warm	Transplant out: May 2
Peas	cool	Sow (spring): March 21 · Sow (fall): August 24
Spinach	cool	Sow (spring): March 14 · Sow (fall): August 24
Lettuce	cool	Sow (spring): March 28 · Sow (fall): August 24
Kale	cool	Transplant (spring): April 4 · Sow (fall): August 10
Broccoli	cool	Transplant (spring): April 11
Carrots	cool	Sow (spring): April 4 · Sow (fall): August 10
Onions	cool	Transplant (spring): March 28
Potatoes	cool	Plant seed potatoes: April 11
Radishes	cool	Sow (spring): March 28 · Sow (fall): September 7

Dates are computed from Palatine'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

Schaumburg, IL Arlington Heights, IL Buffalo Grove, IL Mount Prospect, IL Hoffman Estates, IL Wheeling, IL Streamwood, IL Des Plaines, 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 — Barrington 3sw, IL, 5.1 mi (confidence: high). Monthly weather normals: Barrington 3sw, IL, 5.1 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.