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

Planting zone for 83803 — Bayview, ID

ZIP code 83803 (Bayview, Kootenai County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is May 22 and the first fall frost September 22.

Where ZIP 83803 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 frostMay 22
First frostSep 22
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 Bayview, ID…

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 Bayview, ID

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 22median — 50% chance of a later frost
Safe for tender plantsJune 6only 10% chance of frost after
First fall frostSeptember 22median — 10% chance by Sep 3
Growing season122 daysfrost-free, median

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

From the NOAA station Bayview Model Basin, ID — 9 miles away, elevation 2,087 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 83803

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 10 – Apr 24
SpinachSow outdoors · Apr 10 – May 1
Broccoli, cabbageStart indoors · Mar 13 – Mar 27
Broccoli, cabbageTransplant · May 1 – May 15
Onion setsPlant outdoors · Apr 24 – May 8
PotatoesPlant outdoors · May 1 – May 15
LettuceSow outdoors · Apr 24 – May 8
Carrots, beetsSow outdoors · May 1 – May 15
TomatoesStart indoors · Mar 27 – Apr 10
TomatoesTransplant · May 29 – Jun 12
Peppers, eggplantStart indoors · Mar 13 – Mar 27
Peppers, eggplantTransplant · Jun 5 – Jun 19
BeansSow outdoors · May 29 – Jun 12
Sweet cornSow outdoors · May 29 – Jun 12
Cucumbers, squashSow outdoors · May 29 – Jun 12
Fall lettuce, spinachSow outdoors · Jul 28 – Aug 11
GarlicPlant cloves · Sep 8 – Oct 13
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 22) and first fall frost (Sep 22) 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 83803 came on Apr 21 — 9 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 6b in Idaho

570 plants native to the lower 48 states, recorded in Idaho, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. Each links to its USDA PLANTS profile.

Trees 30

balsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblue spruce100 ft · blooms late spring · medium shade tolerance · to −38 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °FDouglas-fir200 ft · blooms mid spring · medium shade tolerance · to −33 °FEngelmann spruce120 ft · blooms late spring · low shade tolerance · to −50 °F

Shrubs 98

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 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FBarclay's willow15 ft · high shade tolerance · to −43 °Fbeaked hazelnut15 ft · blooms early spring · low shade tolerance · to −47 °F

Wildflowers & perennials 276

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 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °F

Grasses 154

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 1

western 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 Bayview, ID.

Soil in Bayview, ID

The soil mapped at the center of ZIP 83803 is Ahrs — 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: Rubble land-Ahrs family-Typic Haplocryands family, complex.

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 83803; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Bayview, ID

Summer high80 °Faverage high, July
Winter low22 °Faverage low, December
Hot days9days a year at 90 °F or more
Freezing nights172nights a year at 32 °F or less
Growing degree days1,479base 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)
Precipitation58.2 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 35 °F, low 23 °F 35°23° JanFebruary: average high 38 °F, low 23 °F 38°23° FebMarch: average high 45 °F, low 28 °F 45°28° MarApril: average high 54 °F, low 33 °F 54°33° AprMay: average high 64 °F, low 39 °F 64°39° MayJune: average high 71 °F, low 45 °F 71°45° JunJuly: average high 80 °F, low 50 °F 80°50° JulAugust: average high 80 °F, low 49 °F 80°49° AugSeptember: average high 69 °F, low 42 °F 69°42° SepOctober: average high 54 °F, low 33 °F 54°33° OctNovember: average high 42 °F, low 27 °F 42°27° NovDecember: average high 34 °F, low 22 °F 34°22° Dec

Precipitation by month inches

0″2″4″6″8″January: 8.43 in precipitation 8.4 JanFebruary: 5.68 in precipitation 5.7 FebMarch: 6.93 in precipitation 6.9 MarApril: 4.48 in precipitation 4.5 AprMay: 3.58 in precipitation 3.6 MayJune: 3.04 in precipitation 3.0 JunJuly: 1.11 in precipitation 1.1 JulAugust: 1.17 in precipitation 1.2 AugSeptember: 2.16 in precipitation 2.2 SepOctober: 4.89 in precipitation 4.9 OctNovember: 8.28 in precipitation 8.3 NovDecember: 8.46 in precipitation 8.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bayview Model Basin, ID (9 mi away); precipitation: Mosquito Ridge, ID (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

838096b
Careywood, ID · 10 mi
838116b
Clark Fork, ID · 12 mi
838016b
Athol, ID · 13 mi
838606b
Sagle, ID · 13 mi
838136b
Cocolalla, ID · 15 mi
838366b
Hope, ID · 18 mi
838256b
Dover, ID · 19 mi
838356b
Hayden, ID · 20 mi

Idaho planting zones →

Questions about 83803

What planting zone is ZIP code 83803?

ZIP code 83803 (Bayview, ID) 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 Bayview, ID?

The median last spring frost (32 °F) near 83803 is May 22; after June 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bayview Model Basin station.

When is the first frost in Bayview, ID?

The median first fall frost near 83803 is September 22, giving a median frost-free growing season of 122 days.

When should I plant tomatoes in 83803?

Start tomato seeds indoors around Mar 27 – Apr 10 and set transplants outside around May 29 – Jun 12, one to three weeks after the median last frost.

How much rain and snow does 83803 get?

About 58.2 inches of precipitation a year (NOAA 1991–2020 normals, Mosquito Ridge station).

How hot do summers get in Bayview, ID?

The average high peaks at 80 °F in July, with about 9 days a year at 90 °F or more.

What kind of soil does 83803 have?

The USDA soil survey maps Ahrs at the center of ZIP 83803: slightly decomposed plant material, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Bayview, ID in 2026?

Spring leaf-out near 83803 came on Apr 21 in 2026, 9 days earlier than the 1991–2020 average (Apr 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Bayview, ID?

Long-day onions: the longest day near 83803 is 16 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).