Orland Park, Illinois, United States

Frost dates for Orland Park

The full distribution rather than a single date. Every figure below is a percentile of 30 years of daily minimum temperatures at this location, expressed as the date it fell on.

Median last spring frost

25 April

Half of years are later than this. Not a planting date.

Median first autumn frost

22 October

The far end of the outdoor season.

Frost-free season

180 days

Between those two dates in a median year.

Last and first frost by severity

Read a row as: in this fraction of years, the last frost of spring had already happened by this date. The 90% column is the cautious planting date; the 10% column is the gamble.

Light frost — nights at or below 0°C (32°F). Air temperature reaches freezing. Kills basil, beans and unhardened tomatoes; hardy crops shrug it off.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 13 Apr 25 Apr 5 May 7 Apr 21 May
First of autumn 8 Oct 22 Oct 1 Nov 2 Oct 22 Nov
Frost-free days 202 180 156 every year on record saw this
Moderate frost — nights at or below -2.2°C (28°F). Damages half-hardy plants and most blossom. This is the threshold that decides a fruit crop.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 5 Apr 14 Apr 28 Apr 23 Mar 10 May
First of autumn 19 Oct 1 Nov 16 Nov 10 Oct 27 Nov
Frost-free days 226 201 174 every year on record saw this
Hard frost — nights at or below -4.4°C (24.1°F). Ground freezes and even hardy crops check their growth. Effectively the end of the outdoor year.
Frost 1 year in 10 Median 9 years in 10 Earliest Latest
Last of spring 19 Mar 30 Mar 9 Apr 11 Mar 17 Apr
First of autumn 31 Oct 11 Nov 23 Nov 21 Oct 27 Nov
Frost-free days 250 226 205 every year on record saw this

Dates in the southern hemisphere are computed on a growing year that starts in July, which is why "last of spring" falls where it should rather than in the middle of the calendar.

Chance of frost, week by week

Jan Mar Apr Jul Sep Oct Dec
Chance of at least one air frost during each week of the year, measured across the full record. The flat stretch in the middle is your frost-free season.

Temperature through the year

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Mean monthly temperature across the record. Months shown in blue average at least one air frost.

Monthly means and average number of frost nights.
Month Mean low Mean high Frost nights
January -9.1°C -0.6°C 29.2
February -7.5°C 2.3°C 26.3
March -2°C 9.1°C 22.1
April 3.3°C 15.8°C 7.8
May 9.5°C 21.6°C 0.3
June 15.3°C 26.5°C 0
July 17.8°C 28.5°C 0
August 17.2°C 28.4°C 0
September 12.9°C 25.3°C 0
October 6.1°C 17.9°C 3
November -0.5°C 9.4°C 17.6
December -5.9°C 2.3°C 27.3

Turn these dates into a planting calendar →

Nearby

Compare with places close by

Tinley Park Zone 6a 9 km Last frost 22 Apr First 31 Oct Oak Lawn Zone 6a 12 km Last frost 22 Apr First 31 Oct Bolingbrook Zone 5b 19 km Last frost 25 Apr First 22 Oct Joliet Zone 5b 22 km Last frost 25 Apr First 22 Oct Berwyn Zone 7a 25 km Last frost 4 Apr First 17 Nov Cicero Zone 7a 25 km Last frost 4 Apr First 17 Nov Oak Park Zone 7a 29 km Last frost 4 Apr First 17 Nov Naperville Zone 5b 30 km Last frost 26 Apr First 22 Oct

Seasonal context

Rainfall and the growing season in Orland Park

May has the highest average precipitation (119 mm); January has the lowest (48 mm). Compare this pattern with the planting windows and your water supply.

Jan 48 mm
Feb 51 mm
Mar 64 mm
Apr 94 mm
May 119 mm
Jun 113 mm
Jul 101 mm
Aug 104 mm
Sep 86 mm
Oct 89 mm
Nov 59 mm
Dec 58 mm

During wetter months, check that beds and containers drain after heavy rain. During drier months, plan how you will keep seeds and new transplants watered. Monthly averages can hide long dry spells and intense storms; they do not show soil moisture, humidity or this week's weather.

Source: NASA POWER, corrected MERRA-2 precipitation, 2001–2020. Values are approximate monthly totals, including the water equivalent of snow, from the nearest 0.5° × 0.625° grid cell. This reference period differs from the temperature record. Rainfall provides context and does not change the calculated planting dates. Method and limitations.

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