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

Planting zone for 59932 — Somers, MT

ZIP code 59932 (Somers, Flathead County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 12 and the first fall frost September 25.

Where ZIP 59932 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 frostMay 12
First frostSep 25
2012 zone5a

Was 5a on the 2012 map — a full zone warmer now. 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 Somers, 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 Somers, MT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 12median — 50% chance of a later frost
Safe for tender plantsMay 26only 10% chance of frost after
First fall frostSeptember 25median — 10% chance by Sep 9
Growing season134 daysfrost-free, median

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

From the NOAA station Creston, MT — 11 miles away, elevation 2,936 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 59932

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 31 – Apr 14
SpinachSow outdoors · Mar 31 – Apr 21
Broccoli, cabbageStart indoors · Mar 3 – Mar 17
Broccoli, cabbageTransplant · Apr 21 – May 5
Onion setsPlant outdoors · Apr 14 – Apr 28
PotatoesPlant outdoors · Apr 21 – May 5
LettuceSow outdoors · Apr 14 – Apr 28
Carrots, beetsSow outdoors · Apr 21 – May 5
TomatoesStart indoors · Mar 17 – Mar 31
TomatoesTransplant · May 19 – Jun 2
Peppers, eggplantStart indoors · Mar 3 – Mar 17
Peppers, eggplantTransplant · May 26 – Jun 9
BeansSow outdoors · May 19 – Jun 2
Sweet cornSow outdoors · May 19 – Jun 2
Cucumbers, squashSow outdoors · May 19 – Jun 2
Fall lettuce, spinachSow outdoors · Jul 31 – Aug 14
GarlicPlant cloves · Sep 11 – Oct 16
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 12) and first fall frost (Sep 25) 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 59932 came on Apr 10 — 10 days earlier than the 1991–2020 average (Apr 20).

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 Montana

572 plants native to the lower 48 states, recorded in Montana, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. Each links to its USDA PLANTS profile.

Trees 28

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 100

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 266

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 164

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 Somers, MT.

Soil in Somers, MT

The soil mapped at the center of ZIP 59932 is Kingspoint — 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 classFarmland of unique importanceUSDA classification

Map unit: Kingspoint gravelly silt loam, 15 to 30 percent slopes, lake effect.

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 59932; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Somers, MT

Summer high81 °Faverage high, July
Winter low18 °Faverage low, January
Hot days7days a year at 90 °F or more
Freezing nights179nights a year at 32 °F or less
Growing degree days1,586base 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)
Precipitation25 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 18 °F 32°18° JanFebruary: average high 37 °F, low 19 °F 37°19° FebMarch: average high 45 °F, low 26 °F 45°26° MarApril: average high 55 °F, low 32 °F 55°32° AprMay: average high 65 °F, low 40 °F 65°40° MayJune: average high 71 °F, low 47 °F 71°47° JunJuly: average high 81 °F, low 51 °F 81°51° JulAugust: average high 81 °F, low 49 °F 81°49° AugSeptember: average high 70 °F, low 41 °F 70°41° SepOctober: average high 56 °F, low 32 °F 56°32° OctNovember: average high 41 °F, low 26 °F 41°26° NovDecember: average high 33 °F, low 20 °F 33°20° Dec

Precipitation by month inches

0″1″2″3″January: 2.17 in precipitation 2.2 JanFebruary: 2.11 in precipitation 2.1 FebMarch: 1.88 in precipitation 1.9 MarApril: 2.64 in precipitation 2.6 AprMay: 2.21 in precipitation 2.2 MayJune: 2.90 in precipitation 2.9 JunJuly: 1.07 in precipitation 1.1 JulAugust: 1.12 in precipitation 1.1 AugSeptember: 1.50 in precipitation 1.5 SepOctober: 2.27 in precipitation 2.3 OctNovember: 2.35 in precipitation 2.4 NovDecember: 2.79 in precipitation 2.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Creston, MT (11 mi away); precipitation: Blacktail Mtn, MT (7 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.

599226a
Lakeside, MT · 4 mi
599316a
Rollins, MT · 9 mi
599296a
Proctor, MT · 12 mi
599146a
Dayton, MT · 12 mi
599045b
Kalispell, MT · 13 mi
599015b
Kalispell, MT · 14 mi
599035b
Kalispell, MT · 15 mi
599106a
Big Arm, MT · 16 mi

Montana planting zones →

Questions about 59932

What planting zone is ZIP code 59932?

ZIP code 59932 (Somers, MT) 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 Somers, MT?

The median last spring frost (32 °F) near 59932 is May 12; after May 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Creston station.

When is the first frost in Somers, MT?

The median first fall frost near 59932 is September 25, giving a median frost-free growing season of 134 days.

When should I plant tomatoes in 59932?

Start tomato seeds indoors around Mar 17 – Mar 31 and set transplants outside around May 19 – Jun 2, one to three weeks after the median last frost.

How much rain and snow does 59932 get?

About 25 inches of precipitation a year (NOAA 1991–2020 normals, Blacktail Mtn station).

How hot do summers get in Somers, MT?

The average high peaks at 81 °F in July, with about 7 days a year at 90 °F or more.

What kind of soil does 59932 have?

The USDA soil survey maps Kingspoint at the center of ZIP 59932: slightly decomposed plant material, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Somers, MT in 2026?

Spring leaf-out near 59932 came on Apr 10 in 2026, 10 days earlier than the 1991–2020 average (Apr 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Somers, MT?

Long-day onions: the longest day near 59932 is 16 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 59932 change?

Yes. The 2012 USDA map put 59932 in zone 5a; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.