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

Planting zone for 97352 — Jefferson, OR

ZIP code 97352 (Jefferson, 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 97352 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 Jefferson, 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 Jefferson, 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 — 11 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 97352

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 97352 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 Jefferson, OR.

Soil in Jefferson, OR

The soil mapped at the center of ZIP 97352 is Salem — gravelly silt loam, well drained.

TextureGravelly silt loama good balance for most vegetables

pH6.1slightly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter4%moderate

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Salem gravelly silt loam.

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 97352; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Jefferson, 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 35 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)

Precipitation47.8 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 (11 mi away); precipitation: Turner 6.6 S, OR (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

973928b

Turner, OR · 6 mi

973518b

Independence, OR · 7 mi

Aumsville, OR · 10 mi

973358b

Crabtree, OR · 11 mi

Oregon planting zones →

Questions about 97352

What planting zone is ZIP code 97352?

ZIP code 97352 (Jefferson, 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 Jefferson, OR?

The median last spring frost (32 °F) near 97352 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 Jefferson, OR?

The median first fall frost near 97352 is November 6, giving a median frost-free growing season of 222 days.

When should I plant tomatoes in 97352?

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 97352 get?

About 47.8 inches of precipitation a year (NOAA 1991–2020 normals, Turner 6.6 S station).

How hot do summers get in Jefferson, 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 97352 have?

The USDA soil survey maps Salem at the center of ZIP 97352: gravelly silt loam, well drained, pH about 6.1 (slightly acidic).

Did spring come early in Jefferson, OR in 2026?

Spring leaf-out near 97352 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 Jefferson, OR?

Long-day onions: the longest day near 97352 is 15 h 35 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).