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

Planting zone for 49508 — Grand Rapids, MI

ZIP code 49508 (Grand Rapids, Kent County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 30 and the first fall frost October 14.

Where ZIP 49508 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 frostApr 30
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 Grand Rapids, 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 Grand Rapids, MI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 30median — 50% chance of a later frost
Safe for tender plantsMay 17only 10% chance of frost after
First fall frostOctober 14median — 10% chance by Oct 1
Growing season167 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 18 and returns around October 26.

From the NOAA station Nwsfo Grand Rapids, MI — 4 miles away, elevation 774 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 49508

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 19 – Apr 2
SpinachSow outdoors · Mar 19 – Apr 9
Broccoli, cabbageStart indoors · Feb 19 – Mar 5
Broccoli, cabbageTransplant · Apr 9 – Apr 23
Onion setsPlant outdoors · Apr 2 – Apr 16
PotatoesPlant outdoors · Apr 9 – Apr 23
LettuceSow outdoors · Apr 2 – Apr 16
Carrots, beetsSow outdoors · Apr 9 – Apr 23
TomatoesStart indoors · Mar 5 – Mar 19
TomatoesTransplant · May 7 – May 21
Peppers, eggplantStart indoors · Feb 19 – Mar 5
Peppers, eggplantTransplant · May 14 – May 28
BeansSow outdoors · May 7 – May 21
Sweet cornSow outdoors · May 7 – May 21
Cucumbers, squashSow outdoors · May 7 – May 21
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 (Apr 30) 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 49508 came on Mar 30 — 13 days earlier than the 1991–2020 average (Apr 12).

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.

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 220

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 174

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 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 Grand Rapids, MI.

Soil in Grand Rapids, MI

The soil mapped at the center of ZIP 49508 is Spinks — sand, well drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureSanddrains and warms fast; dries out and needs more feeding
pH6.2slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Urban land-Spinks complex, 0 to 8 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 49508; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Grand Rapids, MI

Summer high82 °Faverage high, July
Winter low17 °Faverage low, January
Hot days8days a year at 90 °F or more
Freezing nights140nights a year at 32 °F or less
Growing degree days2,660base 50 °F — the season’s usable heat
Longest day15 h 21 mindaylight on June 21
Shortest day9 h 01 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation39.3 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 30 °F, low 17 °F 30°17° JanFebruary: average high 33 °F, low 18 °F 33°18° FebMarch: average high 44 °F, low 25 °F 44°25° MarApril: average high 57 °F, low 36 °F 57°36° AprMay: average high 70 °F, low 48 °F 70°48° MayJune: average high 78 °F, low 57 °F 78°57° JunJuly: average high 82 °F, low 62 °F 82°62° JulAugust: average high 80 °F, low 60 °F 80°60° AugSeptember: average high 73 °F, low 52 °F 73°52° SepOctober: average high 60 °F, low 41 °F 60°41° OctNovember: average high 47 °F, low 32 °F 47°32° NovDecember: average high 35 °F, low 24 °F 35°24° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.64 in precipitation 2.6 JanFebruary: 2.08 in precipitation 2.1 FebMarch: 2.45 in precipitation 2.5 MarApril: 3.90 in precipitation 3.9 AprMay: 4.15 in precipitation 4.2 MayJune: 3.87 in precipitation 3.9 JunJuly: 3.65 in precipitation 3.6 JulAugust: 3.49 in precipitation 3.5 AugSeptember: 3.39 in precipitation 3.4 SepOctober: 3.92 in precipitation 3.9 OctNovember: 3.21 in precipitation 3.2 NovDecember: 2.58 in precipitation 2.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Nwsfo Grand Rapids, MI (4 mi away); precipitation: Kentwood 1.6 Wsw, MI (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

495286a
Grand Rapids, MI · <1 mi
495486a
Grand Rapids, MI · 2 mi
495096a
Wyoming, MI · 4 mi
495126a
Grand Rapids, MI · 4 mi
495076a
Grand Rapids, MI · 4 mi
495196a
Wyoming, MI · 5 mi
495066a
Grand Rapids, MI · 5 mi
495466a
Grand Rapids, MI · 6 mi

All 26 ZIP codes in Grand Rapids → · Michigan planting zones →

Questions about 49508

What planting zone is ZIP code 49508?

ZIP code 49508 (Grand Rapids, 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 Grand Rapids, MI?

The median last spring frost (32 °F) near 49508 is April 30; after May 17 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Nwsfo Grand Rapids station.

When is the first frost in Grand Rapids, MI?

The median first fall frost near 49508 is October 14, giving a median frost-free growing season of 167 days.

When should I plant tomatoes in 49508?

Start tomato seeds indoors around Mar 5 – Mar 19 and set transplants outside around May 7 – May 21, one to three weeks after the median last frost.

How much rain and snow does 49508 get?

About 39.3 inches of precipitation a year (NOAA 1991–2020 normals, Kentwood 1.6 Wsw station).

How hot do summers get in Grand Rapids, 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 49508 have?

The USDA soil survey maps Spinks at the center of ZIP 49508: sand, well drained, pH about 6.2 (slightly acidic).

Did spring come early in Grand Rapids, MI in 2026?

Spring leaf-out near 49508 came on Mar 30 in 2026, 13 days earlier than the 1991–2020 average (Apr 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Grand Rapids, MI?

Long-day onions: the longest day near 49508 is 15 h 21 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).