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

Planting zone for 99147 — Lincoln, WA

ZIP code 99147 (Lincoln, Lincoln County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is June 1 and the first fall frost September 22.

Where ZIP 99147 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 frostJun 1

First frostSep 22

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 Lincoln, WA…

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 Lincoln, WA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostJune 1median — 50% chance of a later frost

Safe for tender plantsJune 22only 10% chance of frost after

First fall frostSeptember 22median — 10% chance by Sep 2

Growing season112 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 8 and returns around October 3.

From the NOAA station Wilbur, WA — 14 miles away, elevation 2,264 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 99147

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 20 – May 4

SpinachSow outdoors · Apr 20 – May 11

Broccoli, cabbageStart indoors · Mar 23 – Apr 6

Broccoli, cabbageTransplant · May 11 – May 25

Onion setsPlant outdoors · May 4 – May 18

PotatoesPlant outdoors · May 11 – May 25

LettuceSow outdoors · May 4 – May 18

Carrots, beetsSow outdoors · May 11 – May 25

TomatoesStart indoors · Apr 6 – Apr 20

TomatoesTransplant · Jun 8 – Jun 22

Peppers, eggplantStart indoors · Mar 23 – Apr 6

Peppers, eggplantTransplant · Jun 15 – Jun 29

BeansSow outdoors · Jun 8 – Jun 22

Sweet cornSow outdoors · Jun 8 – Jun 22

Cucumbers, squashSow outdoors · Jun 8 – Jun 22

Fall lettuce, spinachSow outdoors · Jul 28 – Aug 11

GarlicPlant cloves · Sep 8 – Oct 13

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 1) and first fall frost (Sep 22) 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 99147 came on Mar 23 — 8 days earlier than the 1991–2020 average (Mar 31).

average
Mar 312026
Mar 23

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 Washington

590 plants native to the lower 48 states, recorded in Washington, 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 Lincoln, WA.

Soil in Lincoln, WA

The soil mapped at the center of ZIP 99147 is Conconully — very stony fine sandy loam, well drained.

TextureVery stony fine sandy loamdrains and warms fast; dries out and needs more feeding

pH7.2neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Conconully very stony fine sandy loam, 25 to 55 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 99147; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Lincoln, WA

Summer high85 °Faverage high, July

Winter low20 °Faverage low, January

Hot days25days a year at 90 °F or more

Freezing nights174nights a year at 32 °F or less

Growing degree days1,813base 50 °F — the season’s usable heat

Longest day16 h 01 mindaylight on June 21

Shortest day8 h 23 mindaylight on December 21

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

Precipitation12.5 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: Wilbur, WA (14 mi away); precipitation: Wilbur, WA (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

Davenport, WA · 17 mi

991297a

Fruitland, WA · 18 mi

991407a

Keller, WA · 19 mi

990407a

Wellpinit, WA · 21 mi

991036b

Almira, WA · 23 mi

991167a

Coulee Dam, WA · 24 mi

Washington planting zones →

Questions about 99147

What planting zone is ZIP code 99147?

ZIP code 99147 (Lincoln, WA) 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 Lincoln, WA?

The median last spring frost (32 °F) near 99147 is June 1; after June 22 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Wilbur station.

When is the first frost in Lincoln, WA?

The median first fall frost near 99147 is September 22, giving a median frost-free growing season of 112 days.

When should I plant tomatoes in 99147?

Start tomato seeds indoors around Apr 6 – Apr 20 and set transplants outside around Jun 8 – Jun 22, one to three weeks after the median last frost.

How much rain and snow does 99147 get?

About 12.5 inches of precipitation a year (NOAA 1991–2020 normals, Wilbur station).

How hot do summers get in Lincoln, WA?

The average high peaks at 85 °F in July, with about 25 days a year at 90 °F or more.

What kind of soil does 99147 have?

The USDA soil survey maps Conconully at the center of ZIP 99147: very stony fine sandy loam, well drained, pH about 7.2 (neutral).

Did spring come early in Lincoln, WA in 2026?

Spring leaf-out near 99147 came on Mar 23 in 2026, 8 days earlier than the 1991–2020 average (Mar 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Lincoln, WA?

Long-day onions: the longest day near 99147 is 16 h 01 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 99147 change?

Yes. The 2012 USDA map put 99147 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.