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

Planting zone for 62022 — Dow, IL

ZIP code 62022 (Dow, Jersey 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 19.

Where ZIP 62022 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 19
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 Dow, 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 Dow, 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 19median — 10% chance by Oct 7
Growing season187 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around October 30.

From the NOAA station Jerseyville 2 Sw, IL — 7 miles away, elevation 630 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 62022

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 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 14) 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 62022 came on Mar 6 — 13 days earlier than the 1991–2020 average (Mar 19).

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 Dow, IL

The soil mapped at the center of ZIP 62022 is Menfro — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH6.2slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Menfro silt loam, 10 to 18 percent slopes, eroded.

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 62022; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Dow, IL

Summer high87 °Faverage high, July
Winter low19 °Faverage low, January
Hot days29days a year at 90 °F or more
Freezing nights118nights a year at 32 °F or less
Growing degree days3,714base 50 °F — the season’s usable heat
Longest day14 h 54 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
Precipitation42.2 inper year, rain and melted snow
Snowfall13 inper year; 18 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 36 °F, low 19 °F 36°19° JanFebruary: average high 42 °F, low 23 °F 42°23° FebMarch: average high 53 °F, low 32 °F 53°32° MarApril: average high 65 °F, low 42 °F 65°42° AprMay: average high 74 °F, low 54 °F 74°54° MayJune: average high 83 °F, low 63 °F 83°63° JunJuly: average high 87 °F, low 66 °F 87°66° JulAugust: average high 85 °F, low 63 °F 85°63° AugSeptember: average high 79 °F, low 55 °F 79°55° SepOctober: average high 67 °F, low 43 °F 67°43° OctNovember: average high 53 °F, low 33 °F 53°33° NovDecember: average high 41 °F, low 24 °F 41°24° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 2.45 in precipitation, 4.3 in snowfall 2.5❄4 JanFebruary: 2.31 in precipitation, 3.7 in snowfall 2.3❄4 FebMarch: 3.17 in precipitation, 1.6 in snowfall 3.2❄2 MarApril: 4.55 in precipitation 4.5 AprMay: 5.29 in precipitation 5.3 MayJune: 4.12 in precipitation 4.1 JunJuly: 3.56 in precipitation 3.6 JulAugust: 3.72 in precipitation 3.7 AugSeptember: 3.44 in precipitation 3.4 SepOctober: 3.29 in precipitation 3.3 OctNovember: 3.67 in precipitation, 0.7 in snowfall 3.7❄1 NovDecember: 2.65 in precipitation, 2.2 in snowfall 2.6❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Jerseyville 2 Sw, IL (7 mi away); precipitation: Jerseyville 2 Sw, IL (7 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.

620286b
Elsah, IL · 3 mi
620356b
Godfrey, IL · 5 mi
633736b
Portage Des Sioux, MO · 6 mi
620376b
Grafton, IL · 7 mi
620526b
Jerseyville, IL · 8 mi
620126b
Brighton, IL · 10 mi
633867a
West Alton, MO · 11 mi
630347a
Florissant, MO · 11 mi

Illinois planting zones →

Questions about 62022

What planting zone is ZIP code 62022?

ZIP code 62022 (Dow, 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 Dow, IL?

The median last spring frost (32 °F) near 62022 is April 14; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Jerseyville 2 Sw station.

When is the first frost in Dow, IL?

The median first fall frost near 62022 is October 19, giving a median frost-free growing season of 187 days.

When should I plant tomatoes in 62022?

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 62022 get?

About 42.2 inches of precipitation a year and 13 inches of snowfall (NOAA 1991–2020 normals, Jerseyville 2 Sw station).

How hot do summers get in Dow, 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 62022 have?

The USDA soil survey maps Menfro at the center of ZIP 62022: silt loam, well drained, pH about 6.2 (slightly acidic).

Did spring come early in Dow, IL in 2026?

Spring leaf-out near 62022 came on Mar 6 in 2026, 13 days earlier than the 1991–2020 average (Mar 19), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Dow, IL?

Intermediate onions: the longest day near 62022 is 14 h 54 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 62022 change?

Yes. The 2012 USDA map put 62022 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.