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

Planting zone for 62087 — South Roxana, IL

ZIP code 62087 (South Roxana, Madison County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 4 and the first fall frost November 5.

Where ZIP 62087 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostApr 4

First frostNov 5

2012 zone6b

Was 6b 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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for South Roxana, 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 South Roxana, IL

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 4median — 50% chance of a later frost

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

First fall frostNovember 5median — 10% chance by Oct 25

Growing season214 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 25 and returns around November 16.

From the NOAA station Alton - Melvin Price L&D, IL — 6 miles away, elevation 404 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 62087

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 21 – Mar 7

SpinachSow outdoors · Feb 21 – Mar 14

Broccoli, cabbageStart indoors · Jan 24 – Feb 7

Broccoli, cabbageTransplant · Mar 14 – Mar 28

Onion setsPlant outdoors · Mar 7 – Mar 21

PotatoesPlant outdoors · Mar 14 – Mar 28

LettuceSow outdoors · Mar 7 – Mar 21

Carrots, beetsSow outdoors · Mar 14 – Mar 28

TomatoesStart indoors · Feb 7 – Feb 21

TomatoesTransplant · Apr 11 – Apr 25

Peppers, eggplantStart indoors · Jan 24 – Feb 7

Peppers, eggplantTransplant · Apr 18 – May 2

BeansSow outdoors · Apr 11 – Apr 25

Sweet cornSow outdoors · Apr 11 – Apr 25

Cucumbers, squashSow outdoors · Apr 11 – Apr 25

Fall lettuce, spinachSow outdoors · Sep 10 – Sep 24

GarlicPlant cloves · Oct 22 – Nov 26

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 4) and first fall frost (Nov 5) 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 62087 came on Mar 3 — 13 days earlier than the 1991–2020 average (Mar 16).

average
Mar 162026
Mar 3

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 7a in Illinois

633 plants native to the lower 48 states, recorded in Illinois, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 South Roxana, IL.

Soil in South Roxana, IL

The soil mapped at the center of ZIP 62087 is Darwin — silty clay, poorly drained.

TextureSilty clayholds water and nutrients; slow to drain and warm up

pH7.0neutral; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter4.5%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Darwin silty clay, 0 to 2 percent slopes, occasionally flooded, long duration.

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 62087; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in South Roxana, IL

Summer high87 °Faverage high, July

Winter low22 °Faverage low, January

Hot days29days a year at 90 °F or more

Freezing nights85nights a year at 32 °F or less

Growing degree days4,168base 50 °F — the season’s usable heat

Longest day14 h 53 mindaylight on June 21

Shortest day9 h 27 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation45.9 inper year, rain and melted snow

Snowfall11 inper year; 15 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: Alton - Melvin Price L&D, IL (6 mi away); precipitation: Edwardsville 2 W, IL (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

620847a

Roxana, IL · 2 mi

620957a

Wood River, IL · 3 mi

620267a

Edwardsville, IL · 4 mi

620487a

Hartford, IL · 5 mi

620247a

East Alton, IL · 5 mi

631387a

Saint Louis, MO · 7 mi

620347a

Glen Carbon, IL · 7 mi

620187a

Cottage Hills, IL · 7 mi

Illinois planting zones →

Questions about 62087

What planting zone is ZIP code 62087?

ZIP code 62087 (South Roxana, IL) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in South Roxana, IL?

The median last spring frost (32 °F) near 62087 is April 4; after April 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Alton - Melvin Price L&D station.

When is the first frost in South Roxana, IL?

The median first fall frost near 62087 is November 5, giving a median frost-free growing season of 214 days.

When should I plant tomatoes in 62087?

Start tomato seeds indoors around Feb 7 – Feb 21 and set transplants outside around Apr 11 – Apr 25, one to three weeks after the median last frost.

How much rain and snow does 62087 get?

About 45.9 inches of precipitation a year and 11 inches of snowfall (NOAA 1991–2020 normals, Edwardsville 2 W station).

How hot do summers get in South Roxana, IL?

The average high peaks at 87 °F in July, with about 29 days a year at 90 °F or more.

What kind of soil does 62087 have?

The USDA soil survey maps Darwin at the center of ZIP 62087: silty clay, poorly drained, pH about 7.0 (neutral).

Did spring come early in South Roxana, IL in 2026?

Spring leaf-out near 62087 came on Mar 3 in 2026, 13 days earlier than the 1991–2020 average (Mar 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in South Roxana, IL?

Intermediate onions: the longest day near 62087 is 14 h 53 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 62087 change?

Yes. The 2012 USDA map put 62087 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.