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

Planting zone for 48412 — Attica, MI

ZIP code 48412 (Attica, Lapeer County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 4 and the first fall frost October 14.

Where ZIP 48412 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.

Zone6a−10 to −5 °F

Coldest night−23.3 to −20.6 °C

Last frostMay 4

First frostOct 14

2012 zone6a

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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Attica, MI…

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 Attica, MI

JanFebMarAprMayJunJulAugSepOctNovDec

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

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

Safe for tender plantsMay 22only 10% chance of frost after

First fall frostOctober 14median — 10% chance by Sep 29

Growing season160 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 24 and returns around October 28.

From the NOAA station Lapeer Wwtp, MI — 7 miles away, elevation 820 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 48412

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 23 – Apr 6

SpinachSow outdoors · Mar 23 – Apr 13

Broccoli, cabbageStart indoors · Feb 23 – Mar 9

Broccoli, cabbageTransplant · Apr 13 – Apr 27

Onion setsPlant outdoors · Apr 6 – Apr 20

PotatoesPlant outdoors · Apr 13 – Apr 27

LettuceSow outdoors · Apr 6 – Apr 20

Carrots, beetsSow outdoors · Apr 13 – Apr 27

TomatoesStart indoors · Mar 9 – Mar 23

TomatoesTransplant · May 11 – May 25

Peppers, eggplantStart indoors · Feb 23 – Mar 9

Peppers, eggplantTransplant · May 18 – Jun 1

BeansSow outdoors · May 11 – May 25

Sweet cornSow outdoors · May 11 – May 25

Cucumbers, squashSow outdoors · May 11 – May 25

Fall lettuce, spinachSow outdoors · Aug 19 – Sep 2

GarlicPlant cloves · Sep 30 – Nov 4

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 4) and first fall frost (Oct 14) 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 48412 came on Apr 7 — 6 days earlier than the 1991–2020 average (Apr 13).

average
Apr 132026
Apr 7

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 6a in Michigan

580 plants native to the lower 48 states, recorded in Michigan, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. 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 Attica, MI.

Soil in Attica, MI

The soil mapped at the center of ZIP 48412 is Brookston — loam, poorly drained.

TextureLoama good balance for most vegetables

pH6.3slightly acidic; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter3%moderate

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classPrime farmland if drainedUSDA classification

Map unit: Brookston loam.

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 48412; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Attica, MI

Summer high82 °Faverage high, July

Winter low15 °Faverage low, January

Hot days9days a year at 90 °F or more

Freezing nights148nights a year at 32 °F or less

Growing degree days2,576base 50 °F — the season’s usable heat

Longest day15 h 22 mindaylight on June 21

Shortest day9 h 00 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation31.9 inper year, rain and melted snow

Snowfall34 inper year; 60 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: Lapeer Wwtp, MI (7 mi away); precipitation: Lapeer Wwtp, MI (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

484446a

Imlay City, MI · 7 mi

484466a

Lapeer, MI · 8 mi

484616a

North Branch, MI · 9 mi

Columbiaville, MI · 12 mi

480146a

Capac, MI · 13 mi

Michigan planting zones →

Questions about 48412

What planting zone is ZIP code 48412?

ZIP code 48412 (Attica, MI) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Attica, MI?

The median last spring frost (32 °F) near 48412 is May 4; after May 22 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Lapeer Wwtp station.

When is the first frost in Attica, MI?

The median first fall frost near 48412 is October 14, giving a median frost-free growing season of 160 days.

When should I plant tomatoes in 48412?

Start tomato seeds indoors around Mar 9 – Mar 23 and set transplants outside around May 11 – May 25, one to three weeks after the median last frost.

How much rain and snow does 48412 get?

About 31.9 inches of precipitation a year and 34 inches of snowfall (NOAA 1991–2020 normals, Lapeer Wwtp station).

How hot do summers get in Attica, MI?

The average high peaks at 82 °F in July, with about 9 days a year at 90 °F or more.

What kind of soil does 48412 have?

The USDA soil survey maps Brookston at the center of ZIP 48412: loam, poorly drained, pH about 6.3 (slightly acidic).

Did spring come early in Attica, MI in 2026?

Spring leaf-out near 48412 came on Apr 7 in 2026, 6 days earlier than the 1991–2020 average (Apr 13), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Attica, MI?

Long-day onions: the longest day near 48412 is 15 h 22 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).