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

Planting zone for 60416 — Coal City, IL

ZIP code 60416 (Coal City, Grundy County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is April 16 and the first fall frost October 26.

Where ZIP 60416 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostApr 16
First frostOct 26
2012 zone5b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Coal City, 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 Coal City, 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 3only 10% chance of frost after
First fall frostOctober 26median — 10% chance by Oct 13
Growing season191 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 5 and returns around November 6.

From the NOAA station Channahon Dresden Isl Dam, IL — 7 miles away, elevation 505 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 60416

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 · Aug 31 – Sep 14
GarlicPlant cloves · Oct 12 – Nov 16
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Oct 26) 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 60416 came on Mar 19 — 16 days earlier than the 1991–2020 average (Apr 4).

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).

Native plants for zone 5b in Illinois

584 plants native to the lower 48 states, recorded in Illinois, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

Trees 77

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 102

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 210

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 173

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °F

Vines 7

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Coal City, IL.

Soil in Coal City, IL

The soil mapped at the center of ZIP 60416 is Sparta — loamy fine sand, excessively drained.

TextureLoamy fine sanddrains and warms fast; dries out and needs more feeding
pH6.5neutral; most vegetables like 6.0–7.0
DrainageExcessively drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Sparta loamy fine sand, 1 to 6 percent slopes.

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 60416; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Coal City, IL

Summer high85 °Faverage high, July
Winter low17 °Faverage low, January
Hot days21days a year at 90 °F or more
Freezing nights127nights a year at 32 °F or less
Growing degree days3,332base 50 °F — the season’s usable heat
Longest day15 h 10 mindaylight on June 21
Shortest day9 h 11 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation38.5 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 17 °F 32°17° JanFebruary: average high 37 °F, low 20 °F 37°20° FebMarch: average high 48 °F, low 30 °F 48°30° MarApril: average high 61 °F, low 40 °F 61°40° AprMay: average high 72 °F, low 51 °F 72°51° MayJune: average high 81 °F, low 60 °F 81°60° JunJuly: average high 85 °F, low 65 °F 85°65° JulAugust: average high 83 °F, low 63 °F 83°63° AugSeptember: average high 77 °F, low 56 °F 77°56° SepOctober: average high 64 °F, low 44 °F 64°44° OctNovember: average high 50 °F, low 33 °F 50°33° NovDecember: average high 37 °F, low 23 °F 37°23° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.11 in precipitation 2.1 JanFebruary: 1.81 in precipitation 1.8 FebMarch: 2.45 in precipitation 2.5 MarApril: 3.70 in precipitation 3.7 AprMay: 4.64 in precipitation 4.6 MayJune: 4.62 in precipitation 4.6 JunJuly: 3.97 in precipitation 4.0 JulAugust: 4.14 in precipitation 4.1 AugSeptember: 3.32 in precipitation 3.3 SepOctober: 3.13 in precipitation 3.1 OctNovember: 2.58 in precipitation 2.6 NovDecember: 2.04 in precipitation 2.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Channahon Dresden Isl Dam, IL (7 mi away); precipitation: Coal City 0.4 N, IL (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5b.

604085b
Braidwood, IL · 4 mi
604075b
Braceville, IL · 4 mi
604445b
Mazon, IL · 7 mi
604745b
South Wilmington, IL · 7 mi
604815b
Wilmington, IL · 9 mi
604245b
Gardner, IL · 9 mi
604505b
Morris, IL · 9 mi
604105b
Channahon, IL · 10 mi

Illinois planting zones →

Questions about 60416

What planting zone is ZIP code 60416?

ZIP code 60416 (Coal City, IL) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Coal City, IL?

The median last spring frost (32 °F) near 60416 is April 16; after May 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Channahon Dresden Isl Dam station.

When is the first frost in Coal City, IL?

The median first fall frost near 60416 is October 26, giving a median frost-free growing season of 191 days.

When should I plant tomatoes in 60416?

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 60416 get?

About 38.5 inches of precipitation a year (NOAA 1991–2020 normals, Coal City 0.4 N station).

How hot do summers get in Coal City, IL?

The average high peaks at 85 °F in July, with about 21 days a year at 90 °F or more.

What kind of soil does 60416 have?

The USDA soil survey maps Sparta at the center of ZIP 60416: loamy fine sand, excessively drained, pH about 6.5 (neutral).

Did spring come early in Coal City, IL in 2026?

Spring leaf-out near 60416 came on Mar 19 in 2026, 16 days earlier than the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Coal City, IL?

Long-day onions: the longest day near 60416 is 15 h 10 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).