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

Planting zone for 97439 — Florence, OR

ZIP code 97439 (Florence, Lane County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is April 10 and the first fall frost November 15.

Where ZIP 97439 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.

Zone9a20 to 25 °F

Coldest night−6.7 to −3.9 °C

Last frostApr 10

First frostNov 15

2012 zone9a

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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Florence, 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 Florence, OR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 10median — 50% chance of a later frost

Safe for tender plantsMay 5only 10% chance of frost after

First fall frostNovember 15median — 10% chance by Oct 23

Growing season220 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 26 and returns around December 12.

From the NOAA station Florence #2, OR — 6 miles away, elevation 75 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 97439

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 27 – Mar 13

SpinachSow outdoors · Feb 27 – Mar 20

Broccoli, cabbageStart indoors · Jan 30 – Feb 13

Broccoli, cabbageTransplant · Mar 20 – Apr 3

Onion setsPlant outdoors · Mar 13 – Mar 27

PotatoesPlant outdoors · Mar 20 – Apr 3

LettuceSow outdoors · Mar 13 – Mar 27

Carrots, beetsSow outdoors · Mar 20 – Apr 3

TomatoesStart indoors · Feb 13 – Feb 27

TomatoesTransplant · Apr 17 – May 1

Peppers, eggplantStart indoors · Jan 30 – Feb 13

Peppers, eggplantTransplant · Apr 24 – May 8

BeansSow outdoors · Apr 17 – May 1

Sweet cornSow outdoors · Apr 17 – May 1

Cucumbers, squashSow outdoors · Apr 17 – May 1

Fall lettuce, spinachSow outdoors · Sep 20 – Oct 4

GarlicPlant cloves · Nov 1 – Dec 6

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 10) and first fall frost (Nov 15) 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 97439 came on Feb 1 — 7 days earlier than the 1991–2020 average (Feb 8).

average
Feb 82026
Feb 1

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 9a in Oregon

666 plants native to the lower 48 states, recorded in Oregon, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. 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 Florence, OR.

Soil in Florence, OR

The soil mapped at the center of ZIP 97439 is Preacher — loam, well drained.

TextureLoama good balance for most vegetables

pH5.0strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter6.5%high

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Preacher-Bohannon-Slickrock complex, 50 to 75 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 97439; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Florence, OR

Summer high68 °Faverage high, July

Winter low37 °Faverage low, February

Hot days0days a year at 90 °F or more

Freezing nights32nights a year at 32 °F or less

Growing degree days1,122base 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)

Precipitation75.5 inper year, rain and melted snow

Snowfall1 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Florence #2, OR (6 mi away); precipitation: Florence #2, OR (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

974809a

Swisshome, OR · 10 mi

Tidewater, OR · 21 mi

Oregon planting zones →

Questions about 97439

What planting zone is ZIP code 97439?

ZIP code 97439 (Florence, OR) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Florence, OR?

The median last spring frost (32 °F) near 97439 is April 10; after May 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Florence #2 station.

When is the first frost in Florence, OR?

The median first fall frost near 97439 is November 15, giving a median frost-free growing season of 220 days.

When should I plant tomatoes in 97439?

Start tomato seeds indoors around Feb 13 – Feb 27 and set transplants outside around Apr 17 – May 1, one to three weeks after the median last frost.

How much rain and snow does 97439 get?

About 75.5 inches of precipitation a year and 1 inches of snowfall (NOAA 1991–2020 normals, Florence #2 station).

How hot do summers get in Florence, OR?

The average high peaks at 68 °F in July, with about 0 days a year at 90 °F or more.

What kind of soil does 97439 have?

The USDA soil survey maps Preacher at the center of ZIP 97439: loam, well drained, pH about 5.0 (strongly acidic).

Did spring come early in Florence, OR in 2026?

Spring leaf-out near 97439 came on Feb 1 in 2026, 7 days earlier than the 1991–2020 average (Feb 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Florence, OR?

Long-day onions: the longest day near 97439 is 15 h 30 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).