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

Planting zone for 59925 — Marion, MT

ZIP code 59925 (Marion, Flathead County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 31 and the first fall frost September 10.

Where ZIP 59925 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.

Zone4b−25 to −20 °F
Coldest night−31.7 to −28.9 °C
Last frostMay 31
First frostSep 10
2012 zone4b

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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Marion, MT…

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 Marion, MT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 31median — 50% chance of a later frost
Safe for tender plantsJune 22only 10% chance of frost after
First fall frostSeptember 10median — 10% chance by Aug 26
Growing season100 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 10 and returns around September 27.

From the NOAA station Kalispell Glacier Airport, MT — 32 miles away, elevation 2,956 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 59925

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 19 – May 3
SpinachSow outdoors · Apr 19 – May 10
Broccoli, cabbageStart indoors · Mar 22 – Apr 5
Broccoli, cabbageTransplant · May 10 – May 24
Onion setsPlant outdoors · May 3 – May 17
PotatoesPlant outdoors · May 10 – May 24
LettuceSow outdoors · May 3 – May 17
Carrots, beetsSow outdoors · May 10 – May 24
TomatoesStart indoors · Apr 5 – Apr 19
TomatoesTransplant · Jun 7 – Jun 21
Peppers, eggplantStart indoors · Mar 22 – Apr 5
Peppers, eggplantTransplant · Jun 14 – Jun 28
BeansSow outdoors · Jun 7 – Jun 21
Sweet cornSow outdoors · Jun 7 – Jun 21
Cucumbers, squashSow outdoors · Jun 7 – Jun 21
Fall lettuce, spinachSow outdoors · Jul 16 – Jul 30
GarlicPlant cloves · Aug 27 – Oct 1
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 31) and first fall frost (Sep 10) 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 59925 came on Apr 24 — 6 days earlier than the 1991–2020 average (Apr 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 4b in Montana

506 plants native to the lower 48 states, recorded in Montana, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. Each links to its USDA PLANTS profile.

Trees 23

American elm120 ft · blooms early spring · medium shade tolerance · to −46 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °FDouglas-fir200 ft · blooms mid spring · medium shade tolerance · to −33 °Feastern cottonwood190 ft · blooms spring · high shade tolerance · to −43 °F

Shrubs 87

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °F

Wildflowers & perennials 229

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °F

Grasses 155

Alaska oniongrass3 ft · blooms mid spring · low shade tolerance · to −33 °Falkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAlpine Meadow-Foxtail0.5 ft · blooms mid spring · medium shade tolerance · to −33 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °F

Vines 3

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fwestern white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °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 Marion, MT.

Soil in Marion, MT

The soil mapped at the center of ZIP 59925 is Pleasantvalley — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer
pH5.5moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter75%high
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Pleasantvalley-Winfall, dry complex, 2 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 59925; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Marion, MT

Summer high78 °Faverage high, July
Winter low15 °Faverage low, January
Hot days5days a year at 90 °F or more
Freezing nights239nights a year at 32 °F or less
Growing degree days882base 50 °F — the season’s usable heat
Longest day16 h 03 mindaylight on June 21
Shortest day8 h 22 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation17.2 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 30 °F, low 15 °F 30°15° JanFebruary: average high 35 °F, low 15 °F 35°15° FebMarch: average high 43 °F, low 22 °F 43°22° MarApril: average high 53 °F, low 28 °F 53°28° AprMay: average high 62 °F, low 34 °F 62°34° MayJune: average high 69 °F, low 40 °F 69°40° JunJuly: average high 78 °F, low 42 °F 78°42° JulAugust: average high 78 °F, low 40 °F 78°40° AugSeptember: average high 67 °F, low 34 °F 67°34° SepOctober: average high 52 °F, low 27 °F 52°27° OctNovember: average high 37 °F, low 22 °F 37°22° NovDecember: average high 29 °F, low 15 °F 29°15° Dec

Precipitation by month inches

0″1″2″3″January: 1.24 in precipitation 1.2 JanFebruary: 0.90 in precipitation 0.9 FebMarch: 1.04 in precipitation 1.0 MarApril: 1.38 in precipitation 1.4 AprMay: 1.73 in precipitation 1.7 MayJune: 2.40 in precipitation 2.4 JunJuly: 1.54 in precipitation 1.5 JulAugust: 0.82 in precipitation 0.8 AugSeptember: 1.48 in precipitation 1.5 SepOctober: 1.59 in precipitation 1.6 OctNovember: 1.58 in precipitation 1.6 NovDecember: 1.48 in precipitation 1.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Libby 32 Sse, MT (19 mi away); precipitation: Kalispell 10.1 Sw, MT (17 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

599205b
Kila, MT · 11 mi
599296a
Proctor, MT · 22 mi
599035b
Kalispell, MT · 22 mi
599015b
Kalispell, MT · 24 mi
598486a
Lonepine, MT · 24 mi
599156a
Elmo, MT · 25 mi
599236a
Libby, MT · 27 mi
599146a
Dayton, MT · 27 mi

Montana planting zones →

Questions about 59925

What planting zone is ZIP code 59925?

ZIP code 59925 (Marion, MT) is in USDA hardiness zone 4b on the 2023 map: the coldest night of an average winter reaches −25 to −20 °F (−31.7 to −28.9 °C).

When is the last frost in Marion, MT?

The median last spring frost (32 °F) near 59925 is May 31; after June 22 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Kalispell Glacier Airport station.

When is the first frost in Marion, MT?

The median first fall frost near 59925 is September 10, giving a median frost-free growing season of 100 days.

When should I plant tomatoes in 59925?

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

How much rain and snow does 59925 get?

About 17.2 inches of precipitation a year (NOAA 1991–2020 normals, Kalispell 10.1 Sw station).

How hot do summers get in Marion, MT?

The average high peaks at 78 °F in July, with about 5 days a year at 90 °F or more.

What kind of soil does 59925 have?

The USDA soil survey maps Pleasantvalley at the center of ZIP 59925: slightly decomposed plant material, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Marion, MT in 2026?

Spring leaf-out near 59925 came on Apr 24 in 2026, 6 days earlier than the 1991–2020 average (Apr 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Marion, MT?

Long-day onions: the longest day near 59925 is 16 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).