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

Planting zone for 62023 — Eagarville, IL

ZIP code 62023 (Eagarville, Macoupin 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 21.

Where ZIP 62023 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 21
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 Eagarville, 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 Eagarville, 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 21median — 10% chance by Oct 5
Growing season188 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 2 and returns around November 1.

From the NOAA station Carlinville, IL — 13 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 62023

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 26 – Sep 9
GarlicPlant cloves · Oct 7 – Nov 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 14) and first fall frost (Oct 21) 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 62023 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).

Soil in Eagarville, IL

The soil mapped at the center of ZIP 62023 is Homen — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH6.5neutral; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classprime farmlandUSDA classification

Map unit: Homen 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 62023; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Eagarville, IL

Summer high86 °Faverage high, July
Winter low19 °Faverage low, January
Hot days27days a year at 90 °F or more
Freezing nights110nights a year at 32 °F or less
Growing degree days3,725base 50 °F — the season’s usable heat
Longest day14 h 55 mindaylight on June 21
Shortest day9 h 25 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation43.5 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 36 °F, low 19 °F 36°19° JanFebruary: average high 41 °F, low 23 °F 41°23° FebMarch: average high 52 °F, low 32 °F 52°32° MarApril: average high 65 °F, low 43 °F 65°43° AprMay: average high 74 °F, low 54 °F 74°54° MayJune: average high 83 °F, low 63 °F 83°63° JunJuly: average high 86 °F, low 66 °F 86°66° JulAugust: average high 85 °F, low 64 °F 85°64° AugSeptember: average high 79 °F, low 55 °F 79°55° SepOctober: average high 67 °F, low 44 °F 67°44° OctNovember: average high 53 °F, low 33 °F 53°33° NovDecember: average high 41 °F, low 25 °F 41°25° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 2.71 in precipitation 2.7 JanFebruary: 2.30 in precipitation 2.3 FebMarch: 3.26 in precipitation 3.3 MarApril: 4.83 in precipitation 4.8 AprMay: 5.11 in precipitation 5.1 MayJune: 4.45 in precipitation 4.5 JunJuly: 4.10 in precipitation 4.1 JulAugust: 3.64 in precipitation 3.6 AugSeptember: 3.52 in precipitation 3.5 SepOctober: 3.31 in precipitation 3.3 OctNovember: 3.64 in precipitation 3.6 NovDecember: 2.64 in precipitation 2.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Carlinville, IL (13 mi away); precipitation: Mount Olive 0.4 S, IL (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

620096b
Benld, IL · 1 mi
620856b
Sawyerville, IL · 2 mi
620696b
Mount Olive, IL · 3 mi
620336b
Gillespie, IL · 4 mi
620936b
Wilsonville, IL · 5 mi
620886b
Staunton, IL · 7 mi
620566b
Litchfield, IL · 7 mi
620586b
Livingston, IL · 10 mi

Illinois planting zones →

Questions about 62023

What planting zone is ZIP code 62023?

ZIP code 62023 (Eagarville, 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 Eagarville, IL?

The median last spring frost (32 °F) near 62023 is April 14; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Carlinville station.

When is the first frost in Eagarville, IL?

The median first fall frost near 62023 is October 21, giving a median frost-free growing season of 188 days.

When should I plant tomatoes in 62023?

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 62023 get?

About 43.5 inches of precipitation a year (NOAA 1991–2020 normals, Mount Olive 0.4 S station).

How hot do summers get in Eagarville, IL?

The average high peaks at 86 °F in July, with about 27 days a year at 90 °F or more.

What kind of soil does 62023 have?

The USDA soil survey maps Homen at the center of ZIP 62023: silt loam, moderately well drained, pH about 6.5 (neutral).

Did spring come early in Eagarville, IL in 2026?

Spring leaf-out near 62023 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 Eagarville, IL?

Intermediate onions: the longest day near 62023 is 14 h 55 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 62023 change?

Yes. The 2012 USDA map put 62023 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.