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

Planting zone for 49408 — Fennville, MI

ZIP code 49408 (Fennville, Allegan County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 28 and the first fall frost October 21.

Where ZIP 49408 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 28
First frostOct 21
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 Fennville, 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 Fennville, MI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 28median — 50% chance of a later frost
Safe for tender plantsMay 16only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 4
Growing season175 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 16 and returns around November 3.

From the NOAA station Holland Tulip City Airport, MI — 12 miles away, elevation 689 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 49408

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 17 – Mar 31
SpinachSow outdoors · Mar 17 – Apr 7
Broccoli, cabbageStart indoors · Feb 17 – Mar 3
Broccoli, cabbageTransplant · Apr 7 – Apr 21
Onion setsPlant outdoors · Mar 31 – Apr 14
PotatoesPlant outdoors · Apr 7 – Apr 21
LettuceSow outdoors · Mar 31 – Apr 14
Carrots, beetsSow outdoors · Apr 7 – Apr 21
TomatoesStart indoors · Mar 3 – Mar 17
TomatoesTransplant · May 5 – May 19
Peppers, eggplantStart indoors · Feb 17 – Mar 3
Peppers, eggplantTransplant · May 12 – May 26
BeansSow outdoors · May 5 – May 19
Sweet cornSow outdoors · May 5 – May 19
Cucumbers, squashSow outdoors · May 5 – May 19
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 28) 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 49408 came on Mar 30 — 11 days earlier than the 1991–2020 average (Apr 10).

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.

Trees 58

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 105

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 hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 221

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °F

Grasses 175

alpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican 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 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 8

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 creeper2 ft · blooms summer · high shade tolerance · to −13 °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 Fennville, MI.

Soil in Fennville, MI

The soil mapped at the center of ZIP 49408 is Adrian — muck, very poorly drained.

TextureMucktop layer
DrainageVery poorly drainedconsider raised beds
Organic matter63.6%high
Hydrologic groupA/Ddrains fast once dried out; wet otherwise
Farmland classFarmland of local importanceUSDA classification

Map unit: Adrian muck, lake moderated, 0 to 1 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 49408; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Fennville, MI

Summer high82 °Faverage high, July
Winter low20 °Faverage low, January
Hot days8days a year at 90 °F or more
Freezing nights123nights a year at 32 °F or less
Growing degree days2,751base 50 °F — the season’s usable heat
Longest day15 h 19 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)
Precipitation41.9 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 32 °F, low 20 °F 32°20° JanFebruary: average high 34 °F, low 21 °F 34°21° FebMarch: average high 44 °F, low 28 °F 44°28° MarApril: average high 57 °F, low 37 °F 57°37° AprMay: average high 69 °F, low 48 °F 69°48° MayJune: average high 78 °F, low 58 °F 78°58° JunJuly: average high 82 °F, low 62 °F 82°62° JulAugust: average high 80 °F, low 60 °F 80°60° AugSeptember: average high 74 °F, low 52 °F 74°52° SepOctober: average high 61 °F, low 43 °F 61°43° OctNovember: average high 48 °F, low 34 °F 48°34° NovDecember: average high 37 °F, low 26 °F 37°26° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.92 in precipitation 2.9 JanFebruary: 2.76 in precipitation 2.8 FebMarch: 2.51 in precipitation 2.5 MarApril: 3.31 in precipitation 3.3 AprMay: 4.12 in precipitation 4.1 MayJune: 4.16 in precipitation 4.2 JunJuly: 3.77 in precipitation 3.8 JulAugust: 4.14 in precipitation 4.1 AugSeptember: 3.73 in precipitation 3.7 SepOctober: 4.67 in precipitation 4.7 OctNovember: 3.04 in precipitation 3.0 NovDecember: 2.80 in precipitation 2.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Holland Tulip City Airport, MI (12 mi away); precipitation: Grand Junction 1.3 Ene, MI (12 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.

494166b
Glenn, MI · 7 mi
494066b
Douglas, MI · 7 mi
494506a
Pullman, MI · 7 mi
494536b
Saugatuck, MI · 7 mi
494196a
Hamilton, MI · 10 mi
490636b
Lacota, MI · 11 mi
494236b
Holland, MI · 12 mi
490906b
South Haven, MI · 12 mi

Michigan planting zones →

Questions about 49408

What planting zone is ZIP code 49408?

ZIP code 49408 (Fennville, 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 Fennville, MI?

The median last spring frost (32 °F) near 49408 is April 28; after May 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Holland Tulip City Airport station.

When is the first frost in Fennville, MI?

The median first fall frost near 49408 is October 21, giving a median frost-free growing season of 175 days.

When should I plant tomatoes in 49408?

Start tomato seeds indoors around Mar 3 – Mar 17 and set transplants outside around May 5 – May 19, one to three weeks after the median last frost.

How much rain and snow does 49408 get?

About 41.9 inches of precipitation a year (NOAA 1991–2020 normals, Grand Junction 1.3 Ene station).

How hot do summers get in Fennville, MI?

The average high peaks at 82 °F in July, with about 8 days a year at 90 °F or more.

What kind of soil does 49408 have?

The USDA soil survey maps Adrian at the center of ZIP 49408: muck, very poorly drained.

Did spring come early in Fennville, MI in 2026?

Spring leaf-out near 49408 came on Mar 30 in 2026, 11 days earlier than the 1991–2020 average (Apr 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Fennville, MI?

Long-day onions: the longest day near 49408 is 15 h 19 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).