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

Planting zone for 61417 — Berwick, IL

ZIP code 61417 (Berwick, Warren County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is April 22 and the first fall frost October 19.

Where ZIP 61417 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostApr 22
First frostOct 19
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Berwick, 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 Berwick, IL

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 22median — 50% chance of a later frost
Safe for tender plantsMay 8only 10% chance of frost after
First fall frostOctober 19median — 10% chance by Oct 5
Growing season177 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 10 and returns around October 27.

From the NOAA station Avon, IL — 9 miles away, elevation 640 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 61417

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 11 – Mar 25
SpinachSow outdoors · Mar 11 – Apr 1
Broccoli, cabbageStart indoors · Feb 11 – Feb 25
Broccoli, cabbageTransplant · Apr 1 – Apr 15
Onion setsPlant outdoors · Mar 25 – Apr 8
PotatoesPlant outdoors · Apr 1 – Apr 15
LettuceSow outdoors · Mar 25 – Apr 8
Carrots, beetsSow outdoors · Apr 1 – Apr 15
TomatoesStart indoors · Feb 25 – Mar 11
TomatoesTransplant · Apr 29 – May 13
Peppers, eggplantStart indoors · Feb 11 – Feb 25
Peppers, eggplantTransplant · May 6 – May 20
BeansSow outdoors · Apr 29 – May 13
Sweet cornSow outdoors · Apr 29 – May 13
Cucumbers, squashSow outdoors · Apr 29 – May 13
Fall lettuce, spinachSow outdoors · Aug 24 – Sep 7
GarlicPlant cloves · Oct 5 – Nov 9
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 22) and first fall frost (Oct 19) 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 61417 came on Mar 15 — 17 days earlier than the 1991–2020 average (Apr 1).

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 5b in Illinois

584 plants native to the lower 48 states, recorded in Illinois, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

Trees 77

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 102

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 210

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 173

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °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 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °F

Vines 7

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °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 Berwick, IL.

Soil in Berwick, IL

The soil mapped at the center of ZIP 61417 is Sawmill — silty clay loam, poorly drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH6.7neutral; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter2.5%moderate
Hydrologic groupB/Dmoderate when drained; wet otherwise
Farmland classPrime farmland if drained and either protected from flooding or not frequently flooded during the growing seasonUSDA classification

Map unit: Sawmill silty clay loam, 0 to 2 percent slopes, frequently flooded.

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 61417; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Berwick, IL

Summer high84 °Faverage high, July
Winter low13 °Faverage low, January
Hot days16days a year at 90 °F or more
Freezing nights144nights a year at 32 °F or less
Growing degree days3,044base 50 °F — the season’s usable heat
Longest day15 h 06 mindaylight on June 21
Shortest day9 h 15 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation37.6 inper year, rain and melted snow
Snowfall24 inper year

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 31 °F, low 13 °F 31°13° JanFebruary: average high 36 °F, low 17 °F 36°17° FebMarch: average high 48 °F, low 26 °F 48°26° MarApril: average high 62 °F, low 37 °F 62°37° AprMay: average high 72 °F, low 49 °F 72°49° MayJune: average high 81 °F, low 59 °F 81°59° JunJuly: average high 84 °F, low 62 °F 84°62° JulAugust: average high 82 °F, low 60 °F 82°60° AugSeptember: average high 77 °F, low 51 °F 77°51° SepOctober: average high 64 °F, low 40 °F 64°40° OctNovember: average high 49 °F, low 29 °F 49°29° NovDecember: average high 36 °F, low 20 °F 36°20° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 1.83 in precipitation, 7.4 in snowfall 1.8❄7 JanFebruary: 1.84 in precipitation, 6 in snowfall 1.8❄6 FebMarch: 2.38 in precipitation, 2.7 in snowfall 2.4❄3 MarApril: 3.62 in precipitation, 1.1 in snowfall 3.6❄1 AprMay: 4.95 in precipitation 5.0 MayJune: 4.38 in precipitation 4.4 JunJuly: 4.23 in precipitation 4.2 JulAugust: 3.67 in precipitation 3.7 AugSeptember: 3.65 in precipitation 3.6 SepOctober: 2.85 in precipitation 2.9 OctNovember: 2.37 in precipitation, 1 in snowfall 2.4❄1 NovDecember: 1.86 in precipitation, 5.8 in snowfall 1.9❄6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Avon, IL (9 mi away); precipitation: Avon, IL (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

614105b
Abingdon, IL · 7 mi
614735b
Roseville, IL · 7 mi
614745b
Saint Augustine, IL · 8 mi
614235b
Cameron, IL · 8 mi
614155b
Avon, IL · 11 mi
614625b
Monmouth, IL · 11 mi
614785b
Smithshire, IL · 11 mi
614706a
Prairie City, IL · 12 mi

Illinois planting zones →

Questions about 61417

What planting zone is ZIP code 61417?

ZIP code 61417 (Berwick, IL) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Berwick, IL?

The median last spring frost (32 °F) near 61417 is April 22; after May 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Avon station.

When is the first frost in Berwick, IL?

The median first fall frost near 61417 is October 19, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 61417?

Start tomato seeds indoors around Feb 25 – Mar 11 and set transplants outside around Apr 29 – May 13, one to three weeks after the median last frost.

How much rain and snow does 61417 get?

About 37.6 inches of precipitation a year and 24 inches of snowfall (NOAA 1991–2020 normals, Avon station).

How hot do summers get in Berwick, IL?

The average high peaks at 84 °F in July, with about 16 days a year at 90 °F or more.

What kind of soil does 61417 have?

The USDA soil survey maps Sawmill at the center of ZIP 61417: silty clay loam, poorly drained, pH about 6.7 (neutral).

Did spring come early in Berwick, IL in 2026?

Spring leaf-out near 61417 came on Mar 15 in 2026, 17 days earlier than the 1991–2020 average (Apr 1), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Berwick, IL?

Long-day onions: the longest day near 61417 is 15 h 06 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).