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

Planting zone for 62817 — Broughton, IL

ZIP code 62817 (Broughton, Hamilton County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 11 and the first fall frost October 21.

Where ZIP 62817 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 11
First frostOct 21
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 Broughton, 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 Broughton, IL

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 11median — 50% chance of a later frost
Safe for tender plantsApril 26only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 6
Growing season190 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 1 and returns around October 30.

From the NOAA station Mcleansboro, IL — 10 miles away, elevation 446 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 62817

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 28 – Mar 14
SpinachSow outdoors · Feb 28 – Mar 21
Broccoli, cabbageStart indoors · Jan 31 – Feb 14
Broccoli, cabbageTransplant · Mar 21 – Apr 4
Onion setsPlant outdoors · Mar 14 – Mar 28
PotatoesPlant outdoors · Mar 21 – Apr 4
LettuceSow outdoors · Mar 14 – Mar 28
Carrots, beetsSow outdoors · Mar 21 – Apr 4
TomatoesStart indoors · Feb 14 – Feb 28
TomatoesTransplant · Apr 18 – May 2
Peppers, eggplantStart indoors · Jan 31 – Feb 14
Peppers, eggplantTransplant · Apr 25 – May 9
BeansSow outdoors · Apr 18 – May 2
Sweet cornSow outdoors · Apr 18 – May 2
Cucumbers, squashSow outdoors · Apr 18 – May 2
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 11) 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 62817 came on Mar 5 — 7 days earlier than the 1991–2020 average (Mar 12).

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.

Trees 81

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 110

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 226

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 186

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 13

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °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 Broughton, IL.

Soil in Broughton, IL

The soil mapped at the center of ZIP 62817 is Zipp — silty clay, poorly drained.

TextureSilty clayholds water and nutrients; slow to drain and warm up
pH6.1slightly acidic; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter3.25%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classPrime farmland if drainedUSDA classification

Map unit: Zipp silty clay, 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 62817; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Broughton, IL

Summer high89 °Faverage high, July
Winter low22 °Faverage low, January
Hot days43days a year at 90 °F or more
Freezing nights110nights a year at 32 °F or less
Growing degree days4,039base 50 °F — the season’s usable heat
Longest day14 h 48 mindaylight on June 21
Shortest day9 h 32 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation47.1 inper year, rain and melted snow
Snowfall13 inper year; 14 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 41 °F, low 22 °F 41°22° JanFebruary: average high 46 °F, low 24 °F 46°24° FebMarch: average high 56 °F, low 34 °F 56°34° MarApril: average high 68 °F, low 44 °F 68°44° AprMay: average high 77 °F, low 55 °F 77°55° MayJune: average high 85 °F, low 63 °F 85°63° JunJuly: average high 89 °F, low 66 °F 89°66° JulAugust: average high 88 °F, low 63 °F 88°63° AugSeptember: average high 82 °F, low 55 °F 82°55° SepOctober: average high 70 °F, low 43 °F 70°43° OctNovember: average high 56 °F, low 33 °F 56°33° NovDecember: average high 45 °F, low 26 °F 45°26° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.55 in precipitation, 3.7 in snowfall 3.5❄4 JanFebruary: 2.90 in precipitation, 3.3 in snowfall 2.9❄3 FebMarch: 4.53 in precipitation, 2.1 in snowfall 4.5❄2 MarApril: 5.29 in precipitation 5.3 AprMay: 4.94 in precipitation 4.9 MayJune: 5.05 in precipitation 5.0 JunJuly: 3.47 in precipitation 3.5 JulAugust: 2.57 in precipitation 2.6 AugSeptember: 3.50 in precipitation 3.5 SepOctober: 3.38 in precipitation, 0.6 in snowfall 3.4❄1 OctNovember: 4.41 in precipitation, 0.2 in snowfall 4.4 NovDecember: 3.50 in precipitation, 3.4 in snowfall 3.5❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mcleansboro, IL (10 mi away); precipitation: Mcleansboro, IL (10 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.

628296b
Dale, IL · 3 mi
629307a
Eldorado, IL · 8 mi
629777a
Raleigh, IL · 8 mi
628596b
Mc Leansboro, IL · 8 mi
628697a
Norris City, IL · 11 mi
629357a
Galatia, IL · 12 mi
628717a
Omaha, IL · 12 mi
629657a
Muddy, IL · 13 mi

Illinois planting zones →

Questions about 62817

What planting zone is ZIP code 62817?

ZIP code 62817 (Broughton, 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 Broughton, IL?

The median last spring frost (32 °F) near 62817 is April 11; after April 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mcleansboro station.

When is the first frost in Broughton, IL?

The median first fall frost near 62817 is October 21, giving a median frost-free growing season of 190 days.

When should I plant tomatoes in 62817?

Start tomato seeds indoors around Feb 14 – Feb 28 and set transplants outside around Apr 18 – May 2, one to three weeks after the median last frost.

How much rain and snow does 62817 get?

About 47.1 inches of precipitation a year and 13 inches of snowfall (NOAA 1991–2020 normals, Mcleansboro station).

How hot do summers get in Broughton, IL?

The average high peaks at 89 °F in July, with about 43 days a year at 90 °F or more.

What kind of soil does 62817 have?

The USDA soil survey maps Zipp at the center of ZIP 62817: silty clay, poorly drained, pH about 6.1 (slightly acidic).

Did spring come early in Broughton, IL in 2026?

Spring leaf-out near 62817 came on Mar 5 in 2026, 7 days earlier than the 1991–2020 average (Mar 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Broughton, IL?

Intermediate onions: the longest day near 62817 is 14 h 48 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 62817 change?

Yes. The 2012 USDA map put 62817 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.