Frost dates for Peoria Greater Peoria Airport, Illinois
Half of years have their last spring frost by April 16, but 1 year in 10 still frosts after May 4.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- May 4
- 1 year in 5
- April 28
- 3 years in 10
- April 23
- 2 years in 5
- April 20
- Half of years (the median)
- April 16
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 9
- 1 year in 5
- October 15
- 3 years in 10
- October 18
- 2 years in 5
- October 20
- Half of years (the median)
- October 23
- Growing season
- about 189 days
- Hardiness zones nearby
- 5b, 6a
- Summer days
- a usual high of about 29 °C85 °F
- Lettuce and spinach run to seed
- June to September, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
Month by month
- January
- high ~1 °C34 °F · low ~-8 °C18 °F · rain ~52 mm2.1 in
- February
- high ~4 °C39 °F · low ~-6 °C21 °F · rain ~50 mm2 in
- March
- high ~11 °C51 °F · low ~0 °C32 °F · rain ~68 mm2.7 in
- April
- high ~18 °C64 °F · low ~6 °C42 °F · rain ~101 mm4 in
- May
- high ~23 °C74 °F · low ~12 °C53 °F · rain ~119 mm4.7 in
- June
- high ~28 °C83 °F · low ~17 °C62 °F · rain ~95 mm3.7 in
- July
- high ~30 °C86 °F · low ~19 °C66 °F · rain ~90 mm3.5 in
- August
- high ~29 °C85 °F · low ~18 °C64 °F · rain ~84 mm3.3 in
- September
- high ~26 °C78 °F · low ~14 °C56 °F · rain ~88 mm3.5 in
- October
- high ~19 °C65 °F · low ~7 °C44 °F · rain ~80 mm3.2 in
- November
- high ~10 °C51 °F · low ~1 °C33 °F · rain ~69 mm2.7 in
- December
- high ~4 °C38 °F · low ~-5 °C23 °F · rain ~56 mm2.2 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Peoria Greater Peoria Airport station (listed by NOAA as Peoria Gtr Peoria Ap, USW00014842), at 40.67, -89.68. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
61517, 61523, 61525, 61526, 61528, 61529, 61531, 61533, 61535, 61536, 61539, 61546…
+21 moreShow fewer
61547, 61552, 61553, 61554, 61559, 61562, 61564, 61569, 61572, 61602, 61603, 61604, 61605, 61606, 61607, 61610, 61611, 61614, 61615, 61616, 61625.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Congerville 2 NW, IL, last frost by April 21
- Hennepin Wtr Trmt Plt, IL, last frost by April 24
- Springfield #2, IL, last frost by April 15
- Aledo, IL, last frost by April 22
- Decatur Airport, IL, last frost by April 16
- Davenport, IA, last frost by April 23
Other stations in Illinois.
- Rantoul, IL, last frost by April 21
- Carlinville, IL, last frost by April 14
- Hillsboro, IL, last frost by April 13
- Aurora, IL, last frost by April 19
- Rockford Greater Rockford Airport, IL, last frost by April 24
- Danville, IL, last frost by April 21
- Lisle-Morton Arboretum, IL, last frost by April 28
- Park Forest, IL, last frost by April 23
When do I plant? · Where the dates come from
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