Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 60101 — Addison, IL

ZIP code 60101 (Addison, DuPage County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 16 and the first fall frost October 28.

Where ZIP 60101 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostApr 16
First frostOct 28
2012 zone5b

Was 5b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Addison, IL…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Addison, IL

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 16median — 50% chance of a later frost
Safe for tender plantsMay 1only 10% chance of frost after
First fall frostOctober 28median — 10% chance by Oct 15
Growing season193 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 5 and returns around November 7.

From the NOAA station Chicago Ohare Intl Airport, IL — 6 miles away, elevation 659 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 60101

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 5 – Mar 19
SpinachSow outdoors · Mar 5 – Mar 26
Broccoli, cabbageStart indoors · Feb 5 – Feb 19
Broccoli, cabbageTransplant · Mar 26 – Apr 9
Onion setsPlant outdoors · Mar 19 – Apr 2
PotatoesPlant outdoors · Mar 26 – Apr 9
LettuceSow outdoors · Mar 19 – Apr 2
Carrots, beetsSow outdoors · Mar 26 – Apr 9
TomatoesStart indoors · Feb 19 – Mar 5
TomatoesTransplant · Apr 23 – May 7
Peppers, eggplantStart indoors · Feb 5 – Feb 19
Peppers, eggplantTransplant · Apr 30 – May 14
BeansSow outdoors · Apr 23 – May 7
Sweet cornSow outdoors · Apr 23 – May 7
Cucumbers, squashSow outdoors · Apr 23 – May 7
Fall lettuce, spinachSow outdoors · Sep 2 – Sep 16
GarlicPlant cloves · Oct 14 – Nov 18
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Oct 28) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 60101 came on Mar 21 — 16 days earlier than the 1991–2020 average (Apr 6).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in Addison, IL

The soil mapped at the center of ZIP 60101 is Orthents — silty clay, moderately well drained.

TextureSilty clayholds water and nutrients; slow to drain and warm up
pH6.7neutral; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Orthents, clayey, undulating.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 60101; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Addison, IL

Summer high85 °Faverage high, July
Winter low19 °Faverage low, January
Hot days17days a year at 90 °F or more
Freezing nights121nights a year at 32 °F or less
Growing degree days3,331base 50 °F — the season’s usable heat
Longest day15 h 14 mindaylight on June 21
Shortest day9 h 07 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation39.9 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 32 °F, low 19 °F 32°19° JanFebruary: average high 36 °F, low 22 °F 36°22° FebMarch: average high 47 °F, low 31 °F 47°31° MarApril: average high 59 °F, low 40 °F 59°40° AprMay: average high 71 °F, low 51 °F 71°51° MayJune: average high 80 °F, low 61 °F 80°61° JunJuly: average high 85 °F, low 66 °F 85°66° JulAugust: average high 83 °F, low 65 °F 83°65° AugSeptember: average high 76 °F, low 57 °F 76°57° SepOctober: average high 63 °F, low 45 °F 63°45° OctNovember: average high 48 °F, low 34 °F 48°34° NovDecember: average high 37 °F, low 24 °F 37°24° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.18 in precipitation 2.2 JanFebruary: 2.22 in precipitation 2.2 FebMarch: 2.50 in precipitation 2.5 MarApril: 3.80 in precipitation 3.8 AprMay: 4.68 in precipitation 4.7 MayJune: 4.66 in precipitation 4.7 JunJuly: 4.00 in precipitation 4.0 JulAugust: 4.17 in precipitation 4.2 AugSeptember: 3.26 in precipitation 3.3 SepOctober: 3.53 in precipitation 3.5 OctNovember: 2.62 in precipitation 2.6 NovDecember: 2.31 in precipitation 2.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Chicago Ohare Intl Airport, IL (6 mi away); precipitation: Villa Park 1.0 Nw, IL (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

2 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

601916a
Wood Dale, IL · 3 mi
601436a
Itasca, IL · 3 mi
601395b
Glendale Heights, IL · 4 mi
601575b
Medinah, IL · 4 mi
601486a
Lombard, IL · 4 mi
601056a
Bensenville, IL · 4 mi
603996a
Wood Dale, IL · 4 mi
601066a
Bensenville, IL · 4 mi

Illinois planting zones →

Questions about 60101

What planting zone is ZIP code 60101?

ZIP code 60101 (Addison, IL) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Addison, IL?

The median last spring frost (32 °F) near 60101 is April 16; after May 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Chicago Ohare Intl Airport station.

When is the first frost in Addison, IL?

The median first fall frost near 60101 is October 28, giving a median frost-free growing season of 193 days.

When should I plant tomatoes in 60101?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 60101 get?

About 39.9 inches of precipitation a year (NOAA 1991–2020 normals, Villa Park 1.0 Nw station).

How hot do summers get in Addison, IL?

The average high peaks at 85 °F in July, with about 17 days a year at 90 °F or more.

What kind of soil does 60101 have?

The USDA soil survey maps Orthents at the center of ZIP 60101: silty clay, moderately well drained, pH about 6.7 (neutral).

Did spring come early in Addison, IL in 2026?

Spring leaf-out near 60101 came on Mar 21 in 2026, 16 days earlier than the 1991–2020 average (Apr 6), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Addison, IL?

Long-day onions: the longest day near 60101 is 15 h 14 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 60101 change?

Yes. The 2012 USDA map put 60101 in zone 5b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.