Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 97325 — Aumsville, OR

ZIP code 97325 (Aumsville, Marion County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 29 and the first fall frost November 6.

Where ZIP 97325 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.

Zone8b15 to 20 °F

Coldest night−9.4 to −6.7 °C

Last frostMar 29

First frostNov 6

2012 zone8b

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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Aumsville, 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 Aumsville, OR

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMarch 29median — 50% chance of a later frost

Safe for tender plantsApril 18only 10% chance of frost after

First fall frostNovember 6median — 10% chance by Oct 20

Growing season222 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 1 and returns around November 22.

From the NOAA station Stayton, OR — 4 miles away, elevation 427 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 97325

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 15 – Mar 1

SpinachSow outdoors · Feb 15 – Mar 8

Broccoli, cabbageStart indoors · Jan 18 – Feb 1

Broccoli, cabbageTransplant · Mar 8 – Mar 22

Onion setsPlant outdoors · Mar 1 – Mar 15

PotatoesPlant outdoors · Mar 8 – Mar 22

LettuceSow outdoors · Mar 1 – Mar 15

Carrots, beetsSow outdoors · Mar 8 – Mar 22

TomatoesStart indoors · Feb 1 – Feb 15

TomatoesTransplant · Apr 5 – Apr 19

Peppers, eggplantStart indoors · Jan 18 – Feb 1

Peppers, eggplantTransplant · Apr 12 – Apr 26

BeansSow outdoors · Apr 5 – Apr 19

Sweet cornSow outdoors · Apr 5 – Apr 19

Cucumbers, squashSow outdoors · Apr 5 – Apr 19

Fall lettuce, spinachSow outdoors · Sep 11 – Sep 25

GarlicPlant cloves · Oct 23 – Nov 27

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 29) and first fall frost (Nov 6) 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 97325 came on Feb 18 — about the same time as the 1991–2020 average (Feb 19).

average
Feb 192026
Feb 18

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 8b in Oregon

661 plants native to the lower 48 states, recorded in Oregon, and rated by the USDA to survive 15 °F or colder — the bottom of zone 8b. Each links to its USDA PLANTS profile.

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 Aumsville, OR.

Soil in Aumsville, OR

The soil mapped at the center of ZIP 97325 is Courtney — gravelly silty clay loam, poorly drained.

TextureGravelly silty clay loamholds water and nutrients; slow to drain and warm up

pH5.6moderately acidic; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter3.5%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Courtney gravelly silty clay loam, 0 to 3 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 97325; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Aumsville, OR

Summer high81 °Faverage high, July

Winter low34 °Faverage low, January

Hot days12days a year at 90 °F or more

Freezing nights51nights a year at 32 °F or less

Growing degree days2,257base 50 °F — the season’s usable heat

Longest day15 h 36 mindaylight on June 21

Shortest day8 h 47 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation49.2 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Stayton, OR (4 mi away); precipitation: Aumsville 1.4 N, OR (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

Silverton, OR · 10 mi

973528b

Jefferson, OR · 10 mi

973748b

Scio, OR · 10 mi

Oregon planting zones →

Questions about 97325

What planting zone is ZIP code 97325?

ZIP code 97325 (Aumsville, OR) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Aumsville, OR?

The median last spring frost (32 °F) near 97325 is March 29; after April 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Stayton station.

When is the first frost in Aumsville, OR?

The median first fall frost near 97325 is November 6, giving a median frost-free growing season of 222 days.

When should I plant tomatoes in 97325?

Start tomato seeds indoors around Feb 1 – Feb 15 and set transplants outside around Apr 5 – Apr 19, one to three weeks after the median last frost.

How much rain and snow does 97325 get?

About 49.2 inches of precipitation a year (NOAA 1991–2020 normals, Aumsville 1.4 N station).

How hot do summers get in Aumsville, OR?

The average high peaks at 81 °F in July, with about 12 days a year at 90 °F or more.

What kind of soil does 97325 have?

The USDA soil survey maps Courtney at the center of ZIP 97325: gravelly silty clay loam, poorly drained, pH about 5.6 (moderately acidic).

Did spring come early in Aumsville, OR in 2026?

Spring leaf-out near 97325 came on Feb 18 in 2026, about the same as the 1991–2020 average (Feb 19), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Aumsville, OR?

Long-day onions: the longest day near 97325 is 15 h 36 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).