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

Planting zone for 49416 — Glenn, MI

ZIP code 49416 (Glenn, Allegan County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 17 and the first fall frost November 5.

Where ZIP 49416 is

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 17

First frostNov 5

2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Glenn, 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 Glenn, MI

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 17median — 50% chance of a later frost

Safe for tender plantsMay 4only 10% chance of frost after

First fall frostNovember 5median — 10% chance by Oct 24

Growing season201 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 5 and returns around November 14.

From the NOAA station S Haven, MI — 9 miles away, elevation 591 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 49416

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 6 – Mar 20

SpinachSow outdoors · Mar 6 – Mar 27

Broccoli, cabbageStart indoors · Feb 6 – Feb 20

Broccoli, cabbageTransplant · Mar 27 – Apr 10

Onion setsPlant outdoors · Mar 20 – Apr 3

PotatoesPlant outdoors · Mar 27 – Apr 10

LettuceSow outdoors · Mar 20 – Apr 3

Carrots, beetsSow outdoors · Mar 27 – Apr 10

TomatoesStart indoors · Feb 20 – Mar 6

TomatoesTransplant · Apr 24 – May 8

Peppers, eggplantStart indoors · Feb 6 – Feb 20

Peppers, eggplantTransplant · May 1 – May 15

BeansSow outdoors · Apr 24 – May 8

Sweet cornSow outdoors · Apr 24 – May 8

Cucumbers, squashSow outdoors · Apr 24 – May 8

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 17) 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 49416 came on Mar 30 — 10 days earlier than the 1991–2020 average (Apr 9).

average
Apr 92026
Mar 30

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 6b in Michigan

582 plants native to the lower 48 states, recorded in Michigan, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. 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 Glenn, MI.

Soil in Glenn, MI

The soil mapped at the center of ZIP 49416 is Covert — sand, moderately well drained.

TextureSanddrains and warms fast; dries out and needs more feeding

pH5.5moderately acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Covert sand, 0 to 4 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 49416; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Glenn, MI

Summer high80 °Faverage high, July

Winter low22 °Faverage low, January

Hot days3days a year at 90 °F or more

Freezing nights108nights a year at 32 °F or less

Growing degree days2,980base 50 °F — the season’s usable heat

Longest day15 h 18 mindaylight on June 21

Shortest day9 h 03 mindaylight on December 21

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

Precipitation37.2 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

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

Nearby ZIP codes

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

494086b

Fennville, MI · 7 mi

490906b

South Haven, MI · 8 mi

Saugatuck, MI · 10 mi

490566a

Grand Junction, MI · 12 mi

490276a

Breedsville, MI · 14 mi

Michigan planting zones →

Questions about 49416

What planting zone is ZIP code 49416?

ZIP code 49416 (Glenn, MI) 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 Glenn, MI?

The median last spring frost (32 °F) near 49416 is April 17; after May 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, S Haven station.

When is the first frost in Glenn, MI?

The median first fall frost near 49416 is November 5, giving a median frost-free growing season of 201 days.

When should I plant tomatoes in 49416?

Start tomato seeds indoors around Feb 20 – Mar 6 and set transplants outside around Apr 24 – May 8, one to three weeks after the median last frost.

How much rain and snow does 49416 get?

About 37.2 inches of precipitation a year (NOAA 1991–2020 normals, S Haven station).

How hot do summers get in Glenn, MI?

The average high peaks at 80 °F in July, with about 3 days a year at 90 °F or more.

What kind of soil does 49416 have?

The USDA soil survey maps Covert at the center of ZIP 49416: sand, moderately well drained, pH about 5.5 (moderately acidic).

Did spring come early in Glenn, MI in 2026?

Spring leaf-out near 49416 came on Mar 30 in 2026, 10 days earlier than the 1991–2020 average (Apr 9), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Glenn, MI?

Long-day onions: the longest day near 49416 is 15 h 18 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).