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

Planting zone for 97350 — Idanha, OR

ZIP code 97350 (Idanha, Marion County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is May 15 and the first fall frost September 30.

Where ZIP 97350 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.

Zone7b5 to 10 °F
Coldest night−15 to −12.2 °C
Last frostMay 15
First frostSep 30
2012 zone8a

Was 8a on the 2012 map — half a zone colder now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Idanha, OR…

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 Idanha, OR

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 15median — 50% chance of a later frost
Safe for tender plantsJune 11only 10% chance of frost after
First fall frostSeptember 30median — 10% chance by Sep 10
Growing season134 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 24 and returns around October 23.

From the NOAA station Marion Forks Fish Hatchery, OR — 4 miles away, elevation 2,474 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 97350

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 3 – Apr 17
SpinachSow outdoors · Apr 3 – Apr 24
Broccoli, cabbageStart indoors · Mar 6 – Mar 20
Broccoli, cabbageTransplant · Apr 24 – May 8
Onion setsPlant outdoors · Apr 17 – May 1
PotatoesPlant outdoors · Apr 24 – May 8
LettuceSow outdoors · Apr 17 – May 1
Carrots, beetsSow outdoors · Apr 24 – May 8
TomatoesStart indoors · Mar 20 – Apr 3
TomatoesTransplant · May 22 – Jun 5
Peppers, eggplantStart indoors · Mar 6 – Mar 20
Peppers, eggplantTransplant · May 29 – Jun 12
BeansSow outdoors · May 22 – Jun 5
Sweet cornSow outdoors · May 22 – Jun 5
Cucumbers, squashSow outdoors · May 22 – Jun 5
Fall lettuce, spinachSow outdoors · Aug 5 – Aug 19
GarlicPlant cloves · Sep 16 – Oct 21
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 15) and first fall frost (Sep 30) 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 97350 came on Mar 19 — 22 days earlier than the 1991–2020 average (Apr 10).

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 7b in Oregon

627 plants native to the lower 48 states, recorded in Oregon, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. Each links to its USDA PLANTS profile.

Trees 40

Alaska cedar75 ft · blooms mid spring · low shade tolerance · to −22 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fbigleaf maple60 ft · blooms mid spring · medium shade tolerance · to −14 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °FBrewer spruce100 ft · blooms early summer · low shade tolerance · to −13 °F

Shrubs 120

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 °Fbeaked hazelnut15 ft · blooms early spring · low shade tolerance · to −47 °Fbig sagebrush4 ft · blooms mid summer · high shade tolerance · to −43 °F

Wildflowers & perennials 292

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 164

Alaska brome5 ft · blooms late spring · low shade tolerance · to −18 °FAlaska 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 timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °F

Vines 2

riverbank 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 Idanha, OR.

Soil in Idanha, OR

The soil mapped at the center of ZIP 97350 is Chucksney — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer
pH4.5strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter75%high
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Chucksney medial loam, 30 to 75 percent slopes, south-facing.

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 97350; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Idanha, OR

Summer high82 °Faverage high, July
Winter low27 °Faverage low, January
Hot days16days a year at 90 °F or more
Freezing nights155nights a year at 32 °F or less
Growing degree days1,528base 50 °F — the season’s usable heat
Longest day15 h 34 mindaylight on June 21
Shortest day8 h 48 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation74.1 inper year, rain and melted snow
Snowfall85 inper year; 80 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°32 °FJanuary: average high 40 °F, low 27 °F 40°27° JanFebruary: average high 44 °F, low 28 °F 44°28° FebMarch: average high 49 °F, low 29 °F 49°29° MarApril: average high 56 °F, low 33 °F 56°33° AprMay: average high 64 °F, low 38 °F 64°38° MayJune: average high 71 °F, low 43 °F 71°43° JunJuly: average high 82 °F, low 47 °F 82°47° JulAugust: average high 82 °F, low 46 °F 82°46° AugSeptember: average high 74 °F, low 41 °F 74°41° SepOctober: average high 60 °F, low 35 °F 60°35° OctNovember: average high 46 °F, low 31 °F 46°31° NovDecember: average high 38 °F, low 27 °F 38°27° Dec

Precipitation by month inches · ❄ = snowfall

0″2″4″6″8″10″12″January: 11.25 in precipitation, 24.3 in snowfall 11.3❄24 JanFebruary: 7.80 in precipitation, 17.5 in snowfall 7.8❄18 FebMarch: 8.59 in precipitation, 13 in snowfall 8.6❄13 MarApril: 6.33 in precipitation, 2.9 in snowfall 6.3❄3 AprMay: 4.39 in precipitation, 0.2 in snowfall 4.4 MayJune: 2.90 in precipitation 2.9 JunJuly: 0.68 in precipitation 0.7 JulAugust: 0.66 in precipitation 0.7 AugSeptember: 2.23 in precipitation 2.2 SepOctober: 6.06 in precipitation, 0.1 in snowfall 6.1 OctNovember: 10.75 in precipitation, 7.6 in snowfall 10.8❄8 NovDecember: 12.44 in precipitation, 19.6 in snowfall 12.4❄20 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Marion Forks Fish Hatchery, OR (4 mi away); precipitation: Marion Forks Fish Hatchery, OR (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

973427b
Detroit, OR · 8 mi
977597a
Sisters, OR · 16 mi
977306b
Camp Sherman, OR · 19 mi
973468b
Gates, OR · 21 mi
973588b
Lyons, OR · 23 mi
973298b
Cascadia, OR · 25 mi
973608b
Mill City, OR · 25 mi
977347a
Culver, OR · 33 mi

Oregon planting zones →

Questions about 97350

What planting zone is ZIP code 97350?

ZIP code 97350 (Idanha, OR) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Idanha, OR?

The median last spring frost (32 °F) near 97350 is May 15; after June 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Marion Forks Fish Hatchery station.

When is the first frost in Idanha, OR?

The median first fall frost near 97350 is September 30, giving a median frost-free growing season of 134 days.

When should I plant tomatoes in 97350?

Start tomato seeds indoors around Mar 20 – Apr 3 and set transplants outside around May 22 – Jun 5, one to three weeks after the median last frost.

How much rain and snow does 97350 get?

About 74.1 inches of precipitation a year and 85 inches of snowfall (NOAA 1991–2020 normals, Marion Forks Fish Hatchery station).

How hot do summers get in Idanha, OR?

The average high peaks at 82 °F in July, with about 16 days a year at 90 °F or more.

What kind of soil does 97350 have?

The USDA soil survey maps Chucksney at the center of ZIP 97350: slightly decomposed plant material, well drained, pH about 4.5 (strongly acidic).

Did spring come early in Idanha, OR in 2026?

Spring leaf-out near 97350 came on Mar 19 in 2026, 22 days earlier than the 1991–2020 average (Apr 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Idanha, OR?

Long-day onions: the longest day near 97350 is 15 h 34 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 97350 change?

Yes. The 2012 USDA map put 97350 in zone 8a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.