Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 30, 2026

Planting zone for Springfield, OR

Springfield, OR is in USDA zone 8b across its 2 ZIP codes. The median last spring frost is April 11 and the first fall frost October 23.

Springfield on the zone map

Outlined: its 2 ZIP code areas · 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

ZIP codes2

Last frostApr 11

First frostOct 23

Growing season196 days

8b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Springfield, 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 Springfield, OR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 11median — 50% chance of a later frost

Safe for tender plantsMay 9only 10% chance of frost after

First fall frostOctober 23median — 10% chance by Oct 6

Growing season196 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 3 and returns around November 11.

From the NOAA station Eugene Mahlon Sweet Airport, OR, elevation 354 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 Springfield

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 28 – Mar 14

SpinachSow outdoors · Feb 28 – Mar 21

Broccoli, cabbageStart indoors · Jan 31 – Feb 14

Broccoli, cabbageTransplant · Mar 21 – Apr 4

Onion setsPlant outdoors · Mar 14 – Mar 28

PotatoesPlant outdoors · Mar 21 – Apr 4

LettuceSow outdoors · Mar 14 – Mar 28

Carrots, beetsSow outdoors · Mar 21 – Apr 4

TomatoesStart indoors · Feb 14 – Feb 28

TomatoesTransplant · Apr 18 – May 2

Peppers, eggplantStart indoors · Jan 31 – Feb 14

Peppers, eggplantTransplant · Apr 25 – May 9

BeansSow outdoors · Apr 18 – May 2

Sweet cornSow outdoors · Apr 18 – May 2

Cucumbers, squashSow outdoors · Apr 18 – May 2

Fall lettuce, spinachSow outdoors · Aug 28 – Sep 11

GarlicPlant cloves · Oct 9 – Nov 13

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 11) and first fall frost (Oct 23) 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 97478 came on Feb 24 — 5 days later than the 1991–2020 average (Feb 19).

average
Feb 192026
Feb 24

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 Springfield, OR.

Soil in Springfield, OR

The soil mapped at the center of ZIP 97478 is Nekia — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer

pH4.5strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter75%high

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Nekia silty 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 97478; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Springfield, OR

Summer high84 °Faverage high, July

Winter low35 °Faverage low, January

Hot days20days a year at 90 °F or more

Freezing nights49nights a year at 32 °F or less

Growing degree days2,343base 50 °F — the season’s usable heat

Longest day15 h 30 mindaylight on June 21

Shortest day8 h 53 mindaylight on December 21

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

Precipitation52.6 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: Leaburg 1 Sw, OR (7 mi away); precipitation: Springfield 6.4 E, OR (4 mi away). Daylight is calculated from latitude.

ZIP codes in Springfield

Oregon planting zones →

Questions about Springfield

What planting zone is Springfield, OR?

Springfield, OR is in USDA hardiness zone 8b on the 2023 map (8b: 15 to 20 °F).

When is the last frost in Springfield, OR?

The median last spring frost is April 11 and the median first fall frost is October 23 (NOAA 1991–2020 normals, Eugene Mahlon Sweet Airport station).

When can I plant a garden in Springfield, OR?

Cool-season crops like peas and spinach go in around Feb 28 – Mar 21; tomatoes, peppers, beans and squash after about Apr 18, once frost risk has passed.

What kind of onions grow in Springfield, OR?

Long-day onions: the longest day is 15 h 30 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Springfield, OR get?

About 52.6 inches of precipitation a year (NOAA 1991–2020 normals).