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

Planting zone for 97375 — Scotts Mills, OR

ZIP code 97375 (Scotts Mills, Marion County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is April 27 and the first fall frost November 4.

Where ZIP 97375 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 frostApr 27
First frostNov 4
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 Scotts Mills, 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 Scotts Mills, OR

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 27median — 50% chance of a later frost
Safe for tender plantsMay 17only 10% chance of frost after
First fall frostNovember 4median — 10% chance by Oct 18
Growing season190 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 25 and returns around November 24.

From the NOAA station Scotts Mills 9 Se, OR — 4 miles away, elevation 2,316 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 97375

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 16 – Mar 30
SpinachSow outdoors · Mar 16 – Apr 6
Broccoli, cabbageStart indoors · Feb 16 – Mar 2
Broccoli, cabbageTransplant · Apr 6 – Apr 20
Onion setsPlant outdoors · Mar 30 – Apr 13
PotatoesPlant outdoors · Apr 6 – Apr 20
LettuceSow outdoors · Mar 30 – Apr 13
Carrots, beetsSow outdoors · Apr 6 – Apr 20
TomatoesStart indoors · Mar 2 – Mar 16
TomatoesTransplant · May 4 – May 18
Peppers, eggplantStart indoors · Feb 16 – Mar 2
Peppers, eggplantTransplant · May 11 – May 25
BeansSow outdoors · May 4 – May 18
Sweet cornSow outdoors · May 4 – May 18
Cucumbers, squashSow outdoors · May 4 – May 18
Fall lettuce, spinachSow outdoors · Sep 9 – Sep 23
GarlicPlant cloves · Oct 21 – Nov 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 27) and first fall frost (Nov 4) 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 97375 came on Feb 13 — 13 days earlier than the 1991–2020 average (Feb 26).

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.

Trees 43

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 132

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 305

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 166

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 Scotts Mills, OR.

Soil in Scotts Mills, OR

The soil mapped at the center of ZIP 97375 is Hullt — clay loam, well drained.

TextureClay loamholds water and nutrients; slow to drain and warm up
pH5.6moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4.5%moderate
Hydrologic groupBwater soaks in moderately
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Hullt clay loam, 20 to 30 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 97375; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Scotts Mills, OR

Summer high75 °Faverage high, July
Winter low33 °Faverage low, January
Hot days2days a year at 90 °F or more
Freezing nights75nights a year at 32 °F or less
Growing degree days1,474base 50 °F — the season’s usable heat
Longest day15 h 37 mindaylight on June 21
Shortest day8 h 46 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation52.8 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°32 °FJanuary: average high 44 °F, low 33 °F 44°33° JanFebruary: average high 46 °F, low 33 °F 46°33° FebMarch: average high 49 °F, low 34 °F 49°34° MarApril: average high 54 °F, low 36 °F 54°36° AprMay: average high 61 °F, low 41 °F 61°41° MayJune: average high 66 °F, low 45 °F 66°45° JunJuly: average high 75 °F, low 50 °F 75°50° JulAugust: average high 75 °F, low 51 °F 75°51° AugSeptember: average high 70 °F, low 49 °F 70°49° SepOctober: average high 56 °F, low 42 °F 56°42° OctNovember: average high 48 °F, low 36 °F 48°36° NovDecember: average high 42 °F, low 33 °F 42°33° Dec

Precipitation by month inches

0″2″4″6″8″January: 6.87 in precipitation 6.9 JanFebruary: 5.37 in precipitation 5.4 FebMarch: 5.88 in precipitation 5.9 MarApril: 5.57 in precipitation 5.6 AprMay: 3.73 in precipitation 3.7 MayJune: 2.43 in precipitation 2.4 JunJuly: 0.56 in precipitation 0.6 JulAugust: 0.67 in precipitation 0.7 AugSeptember: 1.83 in precipitation 1.8 SepOctober: 5.11 in precipitation 5.1 OctNovember: 7.03 in precipitation 7.0 NovDecember: 7.71 in precipitation 7.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Scotts Mills 9 Se, OR (4 mi away); precipitation: Molalla 7.5 S, OR (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

973818b
Silverton, OR · 7 mi
970388b
Molalla, OR · 8 mi
973628b
Mount Angel, OR · 9 mi
973738b
Saint Benedict, OR · 10 mi
973858b
Sublimity, OR · 10 mi
973848b
Mehama, OR · 14 mi
973838b
Stayton, OR · 14 mi
970718b
Woodburn, OR · 15 mi

Oregon planting zones →

Questions about 97375

What planting zone is ZIP code 97375?

ZIP code 97375 (Scotts Mills, 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 Scotts Mills, OR?

The median last spring frost (32 °F) near 97375 is April 27; after May 17 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Scotts Mills 9 Se station.

When is the first frost in Scotts Mills, OR?

The median first fall frost near 97375 is November 4, giving a median frost-free growing season of 190 days.

When should I plant tomatoes in 97375?

Start tomato seeds indoors around Mar 2 – Mar 16 and set transplants outside around May 4 – May 18, one to three weeks after the median last frost.

How much rain and snow does 97375 get?

About 52.8 inches of precipitation a year (NOAA 1991–2020 normals, Molalla 7.5 S station).

How hot do summers get in Scotts Mills, OR?

The average high peaks at 75 °F in July, with about 2 days a year at 90 °F or more.

What kind of soil does 97375 have?

The USDA soil survey maps Hullt at the center of ZIP 97375: clay loam, well drained, pH about 5.6 (moderately acidic).

Did spring come early in Scotts Mills, OR in 2026?

Spring leaf-out near 97375 came on Feb 13 in 2026, 13 days earlier than the 1991–2020 average (Feb 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Scotts Mills, OR?

Long-day onions: the longest day near 97375 is 15 h 37 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).