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

Planting zone for 62442 — Martinsville, IL

ZIP code 62442 (Martinsville, Clark County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 14 and the first fall frost October 20.

Where ZIP 62442 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostApr 14
First frostOct 20
2012 zone6a

Was 6a 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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Martinsville, 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 Martinsville, IL

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 14median — 50% chance of a later frost
Safe for tender plantsApril 30only 10% chance of frost after
First fall frostOctober 20median — 10% chance by Oct 5
Growing season187 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 3 and returns around October 31.

From the NOAA station Casey, IL — 6 miles away, elevation 620 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 62442

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 3 – Mar 17
SpinachSow outdoors · Mar 3 – Mar 24
Broccoli, cabbageStart indoors · Feb 3 – Feb 17
Broccoli, cabbageTransplant · Mar 24 – Apr 7
Onion setsPlant outdoors · Mar 17 – Mar 31
PotatoesPlant outdoors · Mar 24 – Apr 7
LettuceSow outdoors · Mar 17 – Mar 31
Carrots, beetsSow outdoors · Mar 24 – Apr 7
TomatoesStart indoors · Feb 17 – Mar 3
TomatoesTransplant · Apr 21 – May 5
Peppers, eggplantStart indoors · Feb 3 – Feb 17
Peppers, eggplantTransplant · Apr 28 – May 12
BeansSow outdoors · Apr 21 – May 5
Sweet cornSow outdoors · Apr 21 – May 5
Cucumbers, squashSow outdoors · Apr 21 – May 5
Fall lettuce, spinachSow outdoors · Aug 25 – Sep 8
GarlicPlant cloves · Oct 6 – Nov 10
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 14) and first fall frost (Oct 20) 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 62442 came on Mar 10 — 12 days earlier than the 1991–2020 average (Mar 22).

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 6b in Illinois

620 plants native to the lower 48 states, recorded in Illinois, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. Each links to its USDA PLANTS profile.

Trees 80

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 108

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 222

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 182

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °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 °F

Vines 11

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Fgraybark grape50 ft · blooms late spring · medium shade tolerance · to −8 °Fheartleaf peppervine2 ft · blooms late spring · low shade tolerance · to −8 °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 Martinsville, IL.

Soil in Martinsville, IL

The soil mapped at the center of ZIP 62442 is Hoyleton — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH6.0slightly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter3%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classprime farmlandUSDA classification

Map unit: Hoyleton silt loam, 2 to 5 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 62442; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Martinsville, IL

Summer high88 °Faverage high, July
Winter low19 °Faverage low, January
Hot days35days a year at 90 °F or more
Freezing nights112nights a year at 32 °F or less
Growing degree days3,839base 50 °F — the season’s usable heat
Longest day14 h 56 mindaylight on June 21
Shortest day9 h 24 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation45.5 inper year, rain and melted snow
Snowfall12 inper year; 20 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 38 °F, low 19 °F 38°19° JanFebruary: average high 43 °F, low 22 °F 43°22° FebMarch: average high 53 °F, low 32 °F 53°32° MarApril: average high 65 °F, low 43 °F 65°43° AprMay: average high 76 °F, low 54 °F 76°54° MayJune: average high 84 °F, low 63 °F 84°63° JunJuly: average high 88 °F, low 66 °F 88°66° JulAugust: average high 86 °F, low 64 °F 86°64° AugSeptember: average high 81 °F, low 55 °F 81°55° SepOctober: average high 69 °F, low 44 °F 69°44° OctNovember: average high 54 °F, low 33 °F 54°33° NovDecember: average high 42 °F, low 24 °F 42°24° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.25 in precipitation, 5 in snowfall 3.3❄5 JanFebruary: 2.60 in precipitation, 1.9 in snowfall 2.6❄2 FebMarch: 3.34 in precipitation, 1.4 in snowfall 3.3❄1 MarApril: 5.07 in precipitation, 0.1 in snowfall 5.1 AprMay: 4.48 in precipitation 4.5 MayJune: 5.16 in precipitation 5.2 JunJuly: 4.64 in precipitation 4.6 JulAugust: 3.03 in precipitation 3.0 AugSeptember: 3.07 in precipitation 3.1 SepOctober: 3.81 in precipitation 3.8 OctNovember: 4.03 in precipitation, 0.3 in snowfall 4.0 NovDecember: 3.06 in precipitation, 3.2 in snowfall 3.1❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Casey, IL (6 mi away); precipitation: Casey, IL (6 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.

624206b
Casey, IL · 8 mi
624416a
Marshall, IL · 10 mi
624786b
West York, IL · 10 mi
624136b
Annapolis, IL · 11 mi
624776b
West Union, IL · 12 mi
624746a
Westfield, IL · 14 mi
624816b
Yale, IL · 15 mi
624286b
Greenup, IL · 15 mi

Illinois planting zones →

Questions about 62442

What planting zone is ZIP code 62442?

ZIP code 62442 (Martinsville, IL) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Martinsville, IL?

The median last spring frost (32 °F) near 62442 is April 14; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Casey station.

When is the first frost in Martinsville, IL?

The median first fall frost near 62442 is October 20, giving a median frost-free growing season of 187 days.

When should I plant tomatoes in 62442?

Start tomato seeds indoors around Feb 17 – Mar 3 and set transplants outside around Apr 21 – May 5, one to three weeks after the median last frost.

How much rain and snow does 62442 get?

About 45.5 inches of precipitation a year and 12 inches of snowfall (NOAA 1991–2020 normals, Casey station).

How hot do summers get in Martinsville, IL?

The average high peaks at 88 °F in July, with about 35 days a year at 90 °F or more.

What kind of soil does 62442 have?

The USDA soil survey maps Hoyleton at the center of ZIP 62442: silt loam, somewhat poorly drained, pH about 6.0 (slightly acidic).

Did spring come early in Martinsville, IL in 2026?

Spring leaf-out near 62442 came on Mar 10 in 2026, 12 days earlier than the 1991–2020 average (Mar 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Martinsville, IL?

Intermediate onions: the longest day near 62442 is 14 h 56 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 62442 change?

Yes. The 2012 USDA map put 62442 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.