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

Planting zone for 62848 — Irvington, IL

ZIP code 62848 (Irvington, Washington County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 9 and the first fall frost October 24.

Where ZIP 62848 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 9
First frostOct 24
2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Irvington, 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 Irvington, IL

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 9median — 50% chance of a later frost
Safe for tender plantsApril 25only 10% chance of frost after
First fall frostOctober 24median — 10% chance by Oct 10
Growing season196 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 30 and returns around November 2.

From the NOAA station Iuka 12 Sw, IL — 11 miles away, elevation 591 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 62848

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 26 – Mar 12
SpinachSow outdoors · Feb 26 – Mar 19
Broccoli, cabbageStart indoors · Jan 29 – Feb 12
Broccoli, cabbageTransplant · Mar 19 – Apr 2
Onion setsPlant outdoors · Mar 12 – Mar 26
PotatoesPlant outdoors · Mar 19 – Apr 2
LettuceSow outdoors · Mar 12 – Mar 26
Carrots, beetsSow outdoors · Mar 19 – Apr 2
TomatoesStart indoors · Feb 12 – Feb 26
TomatoesTransplant · Apr 16 – Apr 30
Peppers, eggplantStart indoors · Jan 29 – Feb 12
Peppers, eggplantTransplant · Apr 23 – May 7
BeansSow outdoors · Apr 16 – Apr 30
Sweet cornSow outdoors · Apr 16 – Apr 30
Cucumbers, squashSow outdoors · Apr 16 – Apr 30
Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12
GarlicPlant cloves · Oct 10 – Nov 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 9) and first fall frost (Oct 24) 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 62848 came on Mar 2 — 15 days earlier than the 1991–2020 average (Mar 17).

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 Irvington, IL

The soil mapped at the center of ZIP 62848 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 classFarmland of statewide importanceUSDA classification

Map unit: Hoyleton-Darmstadt silt loams, 0 to 2 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 62848; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Irvington, IL

Summer high88 °Faverage high, July
Winter low21 °Faverage low, January
Hot days33days a year at 90 °F or more
Freezing nights109nights a year at 32 °F or less
Growing degree days3,921base 50 °F — the season’s usable heat
Longest day14 h 51 mindaylight on June 21
Shortest day9 h 29 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation45.4 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 39 °F, low 21 °F 39°21° JanFebruary: average high 44 °F, low 24 °F 44°24° FebMarch: average high 54 °F, low 33 °F 54°33° MarApril: average high 66 °F, low 44 °F 66°44° AprMay: average high 75 °F, low 54 °F 75°54° MayJune: average high 84 °F, low 62 °F 84°62° JunJuly: average high 88 °F, low 66 °F 88°66° JulAugust: average high 87 °F, low 64 °F 87°64° AugSeptember: average high 81 °F, low 56 °F 81°56° SepOctober: average high 69 °F, low 45 °F 69°45° OctNovember: average high 55 °F, low 34 °F 55°34° NovDecember: average high 43 °F, low 26 °F 43°26° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 2.88 in precipitation 2.9 JanFebruary: 2.59 in precipitation 2.6 FebMarch: 4.11 in precipitation 4.1 MarApril: 4.78 in precipitation 4.8 AprMay: 5.26 in precipitation 5.3 MayJune: 4.61 in precipitation 4.6 JunJuly: 3.90 in precipitation 3.9 JulAugust: 3.39 in precipitation 3.4 AugSeptember: 3.26 in precipitation 3.3 SepOctober: 3.50 in precipitation 3.5 OctNovember: 4.21 in precipitation 4.2 NovDecember: 2.89 in precipitation 2.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Iuka 12 Sw, IL (11 mi away); precipitation: Walnut Hill 1.5 Wsw, IL (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

628776b
Richview, IL · 3 mi
628016b
Centralia, IL · 6 mi
628036b
Hoyleton, IL · 7 mi
628936b
Walnut Hill, IL · 8 mi
628986b
Woodlawn, IL · 8 mi
628086b
Ashley, IL · 9 mi
622506b
Hoffman, IL · 9 mi
628306b
Dix, IL · 11 mi

Illinois planting zones →

Questions about 62848

What planting zone is ZIP code 62848?

ZIP code 62848 (Irvington, 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 Irvington, IL?

The median last spring frost (32 °F) near 62848 is April 9; after April 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Iuka 12 Sw station.

When is the first frost in Irvington, IL?

The median first fall frost near 62848 is October 24, giving a median frost-free growing season of 196 days.

When should I plant tomatoes in 62848?

Start tomato seeds indoors around Feb 12 – Feb 26 and set transplants outside around Apr 16 – Apr 30, one to three weeks after the median last frost.

How much rain and snow does 62848 get?

About 45.4 inches of precipitation a year (NOAA 1991–2020 normals, Walnut Hill 1.5 Wsw station).

How hot do summers get in Irvington, IL?

The average high peaks at 88 °F in July, with about 33 days a year at 90 °F or more.

What kind of soil does 62848 have?

The USDA soil survey maps Hoyleton at the center of ZIP 62848: silt loam, somewhat poorly drained, pH about 6.0 (slightly acidic).

Did spring come early in Irvington, IL in 2026?

Spring leaf-out near 62848 came on Mar 2 in 2026, 15 days earlier than the 1991–2020 average (Mar 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Irvington, IL?

Intermediate onions: the longest day near 62848 is 14 h 51 min, so day-neutral types bulb best; long-day varieties may not bulb fully.