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

Planting zone for 49421 — Hesperia, MI

ZIP code 49421 (Hesperia, Oceana County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 17 and the first fall frost October 1.

Where ZIP 49421 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 frostMay 17
First frostOct 1
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 Hesperia, 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 Hesperia, MI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 17median — 50% chance of a later frost
Safe for tender plantsJune 1only 10% chance of frost after
First fall frostOctober 1median — 10% chance by Sep 14
Growing season137 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 4 and returns around October 12.

From the NOAA station Hesperia 4 Wnw, MI — 2 miles away, elevation 781 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 49421

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 5 – Apr 19
SpinachSow outdoors · Apr 5 – Apr 26
Broccoli, cabbageStart indoors · Mar 8 – Mar 22
Broccoli, cabbageTransplant · Apr 26 – May 10
Onion setsPlant outdoors · Apr 19 – May 3
PotatoesPlant outdoors · Apr 26 – May 10
LettuceSow outdoors · Apr 19 – May 3
Carrots, beetsSow outdoors · Apr 26 – May 10
TomatoesStart indoors · Mar 22 – Apr 5
TomatoesTransplant · May 24 – Jun 7
Peppers, eggplantStart indoors · Mar 8 – Mar 22
Peppers, eggplantTransplant · May 31 – Jun 14
BeansSow outdoors · May 24 – Jun 7
Sweet cornSow outdoors · May 24 – Jun 7
Cucumbers, squashSow outdoors · May 24 – Jun 7
Fall lettuce, spinachSow outdoors · Aug 6 – Aug 20
GarlicPlant cloves · Sep 17 – Oct 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 17) and first fall frost (Oct 1) 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 49421 came on Apr 10 — 6 days earlier than the 1991–2020 average (Apr 16).

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 Michigan

564 plants native to the lower 48 states, recorded in Michigan, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. 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 103

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 212

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 170

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 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °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 Hesperia, MI.

Soil in Hesperia, MI

The soil mapped at the center of ZIP 49421 is Saugatuck — fine sand, somewhat poorly drained.

TextureFine sanddrains and warms fast; dries out and needs more feeding
pH4.6strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter6%high
Hydrologic groupA/Ddrains fast once dried out; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Saugatuck-Jebavy complex, 0 to 3 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 49421; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hesperia, MI

Summer high82 °Faverage high, July
Winter low14 °Faverage low, January
Hot days7days a year at 90 °F or more
Freezing nights166nights a year at 32 °F or less
Growing degree days2,261base 50 °F — the season’s usable heat
Longest day15 h 26 mindaylight on June 21
Shortest day8 h 56 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation35.9 inper year, rain and melted snow
Snowfall75 inper year; 103 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 31 °F, low 14 °F 31°14° JanFebruary: average high 33 °F, low 14 °F 33°14° FebMarch: average high 44 °F, low 21 °F 44°21° MarApril: average high 56 °F, low 31 °F 56°31° AprMay: average high 68 °F, low 42 °F 68°42° MayJune: average high 78 °F, low 52 °F 78°52° JunJuly: average high 82 °F, low 56 °F 82°56° JulAugust: average high 80 °F, low 55 °F 80°55° AugSeptember: average high 73 °F, low 48 °F 73°48° SepOctober: average high 60 °F, low 37 °F 60°37° OctNovember: average high 46 °F, low 28 °F 46°28° NovDecember: average high 36 °F, low 21 °F 36°21° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.26 in precipitation, 25.3 in snowfall 2.3❄25 JanFebruary: 1.63 in precipitation, 14 in snowfall 1.6❄14 FebMarch: 1.98 in precipitation, 7 in snowfall 2.0❄7 MarApril: 3.85 in precipitation, 1.3 in snowfall 3.9❄1 AprMay: 3.63 in precipitation 3.6 MayJune: 3.54 in precipitation 3.5 JunJuly: 3.01 in precipitation 3.0 JulAugust: 3.06 in precipitation 3.1 AugSeptember: 3.15 in precipitation 3.1 SepOctober: 4.26 in precipitation, 0.2 in snowfall 4.3 OctNovember: 2.91 in precipitation, 4.3 in snowfall 2.9❄4 NovDecember: 2.63 in precipitation, 22.5 in snowfall 2.6❄23 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hesperia 4 Wnw, MI (2 mi away); precipitation: Hesperia 4 Wnw, MI (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

494595b
Walkerville, MI · 10 mi
494256a
Holton, MI · 11 mi
494125b
Fremont, MI · 11 mi
494526a
Rothbury, MI · 11 mi
494206a
Hart, MI · 14 mi
494136a
Fremont, MI · 14 mi
493095b
Bitely, MI · 15 mi
494556a
Shelby, MI · 15 mi

Michigan planting zones →

Questions about 49421

What planting zone is ZIP code 49421?

ZIP code 49421 (Hesperia, MI) 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 Hesperia, MI?

The median last spring frost (32 °F) near 49421 is May 17; after June 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hesperia 4 Wnw station.

When is the first frost in Hesperia, MI?

The median first fall frost near 49421 is October 1, giving a median frost-free growing season of 137 days.

When should I plant tomatoes in 49421?

Start tomato seeds indoors around Mar 22 – Apr 5 and set transplants outside around May 24 – Jun 7, one to three weeks after the median last frost.

How much rain and snow does 49421 get?

About 35.9 inches of precipitation a year and 75 inches of snowfall (NOAA 1991–2020 normals, Hesperia 4 Wnw station).

How hot do summers get in Hesperia, MI?

The average high peaks at 82 °F in July, with about 7 days a year at 90 °F or more.

What kind of soil does 49421 have?

The USDA soil survey maps Saugatuck at the center of ZIP 49421: fine sand, somewhat poorly drained, pH about 4.6 (strongly acidic).

Did spring come early in Hesperia, MI in 2026?

Spring leaf-out near 49421 came on Apr 10 in 2026, 6 days earlier than the 1991–2020 average (Apr 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hesperia, MI?

Long-day onions: the longest day near 49421 is 15 h 26 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).