Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 60012 — Crystal Lake, IL

ZIP code 60012 (Crystal Lake, McHenry County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 1 and the first fall frost October 11.

Where ZIP 60012 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 frostMay 1

First frostOct 11

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 Crystal Lake, 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 Crystal Lake, IL

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 1median — 50% chance of a later frost

Safe for tender plantsMay 19only 10% chance of frost after

First fall frostOctober 11median — 10% chance by Sep 27

Growing season162 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 19 and returns around October 22.

From the NOAA station Mc Henry -Wg Stratton L&D, IL — 4 miles away, elevation 735 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 60012

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 20 – Apr 3

SpinachSow outdoors · Mar 20 – Apr 10

Broccoli, cabbageStart indoors · Feb 20 – Mar 6

Broccoli, cabbageTransplant · Apr 10 – Apr 24

Onion setsPlant outdoors · Apr 3 – Apr 17

PotatoesPlant outdoors · Apr 10 – Apr 24

LettuceSow outdoors · Apr 3 – Apr 17

Carrots, beetsSow outdoors · Apr 10 – Apr 24

TomatoesStart indoors · Mar 6 – Mar 20

TomatoesTransplant · May 8 – May 22

Peppers, eggplantStart indoors · Feb 20 – Mar 6

Peppers, eggplantTransplant · May 15 – May 29

BeansSow outdoors · May 8 – May 22

Sweet cornSow outdoors · May 8 – May 22

Cucumbers, squashSow outdoors · May 8 – May 22

Fall lettuce, spinachSow outdoors · Aug 16 – Aug 30

GarlicPlant cloves · Sep 27 – Nov 1

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 1) and first fall frost (Oct 11) 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 60012 came on Mar 25 — 16 days earlier than the 1991–2020 average (Apr 10).

average
Apr 102026
Mar 25

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.

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 Crystal Lake, IL.

Soil in Crystal Lake, IL

The soil mapped at the center of ZIP 60012 is McHenry — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH6.5neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2%moderate

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: McHenry silt loam, 2 to 4 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 60012; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Crystal Lake, IL

Summer high84 °Faverage high, July

Winter low13 °Faverage low, January

Hot days11days a year at 90 °F or more

Freezing nights144nights a year at 32 °F or less

Growing degree days2,891base 50 °F — the season’s usable heat

Longest day15 h 16 mindaylight on June 21

Shortest day9 h 05 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation37 inper year, rain and melted snow

Snowfall35 inper year; 55 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mc Henry -Wg Stratton L&D, IL (4 mi away); precipitation: Mc Henry -Wg Stratton L&D, IL (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5b.

600145b

Crystal Lake, IL · 3 mi

600505b

Mchenry, IL · 4 mi

601565b

Lake In The Hills, IL · 5 mi

600135b

Cary, IL · 5 mi

600425b

Island Lake, IL · 6 mi

600515b

Mchenry, IL · 7 mi

600215b

Fox River Grove, IL · 7 mi

601025b

Algonquin, IL · 8 mi

All 3 ZIP codes in Crystal Lake → · Illinois planting zones →

Questions about 60012

What planting zone is ZIP code 60012?

ZIP code 60012 (Crystal Lake, 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 Crystal Lake, IL?

The median last spring frost (32 °F) near 60012 is May 1; after May 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mc Henry -Wg Stratton L&D station.

When is the first frost in Crystal Lake, IL?

The median first fall frost near 60012 is October 11, giving a median frost-free growing season of 162 days.

When should I plant tomatoes in 60012?

Start tomato seeds indoors around Mar 6 – Mar 20 and set transplants outside around May 8 – May 22, one to three weeks after the median last frost.

How much rain and snow does 60012 get?

About 37 inches of precipitation a year and 35 inches of snowfall (NOAA 1991–2020 normals, Mc Henry -Wg Stratton L&D station).

How hot do summers get in Crystal Lake, IL?

The average high peaks at 84 °F in July, with about 11 days a year at 90 °F or more.

What kind of soil does 60012 have?

The USDA soil survey maps McHenry at the center of ZIP 60012: silt loam, well drained, pH about 6.5 (neutral).

Did spring come early in Crystal Lake, IL in 2026?

Spring leaf-out near 60012 came on Mar 25 in 2026, 16 days earlier than the 1991–2020 average (Apr 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Crystal Lake, IL?

Long-day onions: the longest day near 60012 is 15 h 16 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).