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

Planting zone for 97825 — Dayville, OR

ZIP code 97825 (Dayville, Grant County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is May 4 and the first fall frost October 6.

Where ZIP 97825 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostMay 4

First frostOct 6

2012 zone6b

Was 6b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Dayville, 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 Dayville, OR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 4median — 50% chance of a later frost

Safe for tender plantsMay 23only 10% chance of frost after

First fall frostOctober 6median — 10% chance by Sep 21

Growing season155 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 18 and returns around October 23.

From the NOAA station Dayville 8 Nw, OR — 14 miles away, elevation 2,261 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 97825

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 23 – Apr 6

SpinachSow outdoors · Mar 23 – Apr 13

Broccoli, cabbageStart indoors · Feb 23 – Mar 9

Broccoli, cabbageTransplant · Apr 13 – Apr 27

Onion setsPlant outdoors · Apr 6 – Apr 20

PotatoesPlant outdoors · Apr 13 – Apr 27

LettuceSow outdoors · Apr 6 – Apr 20

Carrots, beetsSow outdoors · Apr 13 – Apr 27

TomatoesStart indoors · Mar 9 – Mar 23

TomatoesTransplant · May 11 – May 25

Peppers, eggplantStart indoors · Feb 23 – Mar 9

Peppers, eggplantTransplant · May 18 – Jun 1

BeansSow outdoors · May 11 – May 25

Sweet cornSow outdoors · May 11 – May 25

Cucumbers, squashSow outdoors · May 11 – May 25

Fall lettuce, spinachSow outdoors · Aug 11 – Aug 25

GarlicPlant cloves · Sep 22 – Oct 27

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 4) and first fall frost (Oct 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 97825 came on Mar 19 — 24 days earlier than the 1991–2020 average (Apr 12).

average
Apr 122026
Mar 19

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 7a in Oregon

624 plants native to the lower 48 states, recorded in Oregon, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 Dayville, OR.

Soil in Dayville, OR

The soil mapped at the center of ZIP 97825 is Gwin — cobbly silt loam, well drained.

TextureCobbly silt loama good balance for most vegetables

pH6.6neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Gwin-Rockly-Rock outcrop complex, 50 to 90 percent south 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 97825; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Dayville, OR

Summer high93 °Faverage high, July

Winter low27 °Faverage low, December

Hot days62days a year at 90 °F or more

Freezing nights123nights a year at 32 °F or less

Growing degree days2,905base 50 °F — the season’s usable heat

Longest day15 h 32 mindaylight on June 21

Shortest day8 h 50 mindaylight on December 21

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

Precipitation13.1 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: Dayville 8 Nw, OR (14 mi away); precipitation: Dayville 8 Nw, OR (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

978656b

Mount Vernon, OR · 16 mi

978206b

Canyon City, OR · 22 mi

Oregon planting zones →

Questions about 97825

What planting zone is ZIP code 97825?

ZIP code 97825 (Dayville, OR) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Dayville, OR?

The median last spring frost (32 °F) near 97825 is May 4; after May 23 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Dayville 8 Nw station.

When is the first frost in Dayville, OR?

The median first fall frost near 97825 is October 6, giving a median frost-free growing season of 155 days.

When should I plant tomatoes in 97825?

Start tomato seeds indoors around Mar 9 – Mar 23 and set transplants outside around May 11 – May 25, one to three weeks after the median last frost.

How much rain and snow does 97825 get?

About 13.1 inches of precipitation a year (NOAA 1991–2020 normals, Dayville 8 Nw station).

How hot do summers get in Dayville, OR?

The average high peaks at 93 °F in July, with about 62 days a year at 90 °F or more.

What kind of soil does 97825 have?

The USDA soil survey maps Gwin at the center of ZIP 97825: cobbly silt loam, well drained, pH about 6.6 (neutral).

Did spring come early in Dayville, OR in 2026?

Spring leaf-out near 97825 came on Mar 19 in 2026, 24 days earlier than the 1991–2020 average (Apr 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Dayville, OR?

Long-day onions: the longest day near 97825 is 15 h 32 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 97825 change?

Yes. The 2012 USDA map put 97825 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.