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

Planting zone for 97114 — Dayton, OR

ZIP code 97114 (Dayton, Yamhill County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is April 15 and the first fall frost October 26.

Where ZIP 97114 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 15

First frostOct 26

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 Dayton, 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 Dayton, OR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 15median — 50% chance of a later frost

Safe for tender plantsMay 6only 10% chance of frost after

First fall frostOctober 26median — 10% chance by Oct 5

Growing season195 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 3 and returns around November 16.

From the NOAA station Mcminnville Municipal Airport, OR — 3 miles away, elevation 161 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 97114

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 4 – Mar 18

SpinachSow outdoors · Mar 4 – Mar 25

Broccoli, cabbageStart indoors · Feb 4 – Feb 18

Broccoli, cabbageTransplant · Mar 25 – Apr 8

Onion setsPlant outdoors · Mar 18 – Apr 1

PotatoesPlant outdoors · Mar 25 – Apr 8

LettuceSow outdoors · Mar 18 – Apr 1

Carrots, beetsSow outdoors · Mar 25 – Apr 8

TomatoesStart indoors · Feb 18 – Mar 4

TomatoesTransplant · Apr 22 – May 6

Peppers, eggplantStart indoors · Feb 4 – Feb 18

Peppers, eggplantTransplant · Apr 29 – May 13

BeansSow outdoors · Apr 22 – May 6

Sweet cornSow outdoors · Apr 22 – May 6

Cucumbers, squashSow outdoors · Apr 22 – May 6

Fall lettuce, spinachSow outdoors · Aug 31 – Sep 14

GarlicPlant cloves · Oct 12 – Nov 16

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 15) and first fall frost (Oct 26) 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 97114 came on Feb 22 — 4 days later than the 1991–2020 average (Feb 18).

average
Feb 182026
Feb 22

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 Dayton, OR.

Soil in Dayton, OR

The soil mapped at the center of ZIP 97114 is Amity — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables

pH5.8moderately acidic; most vegetables like 6.0–7.0

DrainageSomewhat poorly drainedconsider raised beds

Organic matter3.8%moderate

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classPrime farmland if drainedUSDA classification

Map unit: Amity silt 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 97114; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Dayton, OR

Summer high83 °Faverage high, July

Winter low34 °Faverage low, December

Hot days19days a year at 90 °F or more

Freezing nights47nights a year at 32 °F or less

Growing degree days2,240base 50 °F — the season’s usable heat

Longest day15 h 39 mindaylight on June 21

Shortest day8 h 44 mindaylight on December 21

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

Precipitation37.6 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: Mcminnville Municipal Airport, OR (3 mi away); precipitation: Mcminnville Municipal Airport, OR (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

971278b

Lafayette, OR · 4 mi

971378b

Saint Paul, OR · 7 mi

Mcminnville, OR · 10 mi

971328b

Newberg, OR · 10 mi

Oregon planting zones →

Questions about 97114

What planting zone is ZIP code 97114?

ZIP code 97114 (Dayton, 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 Dayton, OR?

The median last spring frost (32 °F) near 97114 is April 15; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mcminnville Municipal Airport station.

When is the first frost in Dayton, OR?

The median first fall frost near 97114 is October 26, giving a median frost-free growing season of 195 days.

When should I plant tomatoes in 97114?

Start tomato seeds indoors around Feb 18 – Mar 4 and set transplants outside around Apr 22 – May 6, one to three weeks after the median last frost.

How much rain and snow does 97114 get?

About 37.6 inches of precipitation a year (NOAA 1991–2020 normals, Mcminnville Municipal Airport station).

How hot do summers get in Dayton, OR?

The average high peaks at 83 °F in July, with about 19 days a year at 90 °F or more.

What kind of soil does 97114 have?

The USDA soil survey maps Amity at the center of ZIP 97114: silt loam, somewhat poorly drained, pH about 5.8 (moderately acidic).

Did spring come early in Dayton, OR in 2026?

Spring leaf-out near 97114 came on Feb 22 in 2026, 4 days later than the 1991–2020 average (Feb 18), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Dayton, OR?

Long-day onions: the longest day near 97114 is 15 h 39 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).