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

Planting zone for 97819 — Bridgeport, OR

ZIP code 97819 (Bridgeport, Baker County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is May 25 and the first fall frost September 15.

Where ZIP 97819 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostMay 25
First frostSep 15
2012 zone5b

Was 5b on the 2012 map — a full zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Bridgeport, 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 Bridgeport, OR

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 25median — 50% chance of a later frost
Safe for tender plantsJune 16only 10% chance of frost after
First fall frostSeptember 15median — 10% chance by Sep 2
Growing season111 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 8 and returns around September 27.

From the NOAA station Baker City Municipal Airport, OR — 25 miles away, elevation 3,360 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 97819

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 13 – Apr 27
SpinachSow outdoors · Apr 13 – May 4
Broccoli, cabbageStart indoors · Mar 16 – Mar 30
Broccoli, cabbageTransplant · May 4 – May 18
Onion setsPlant outdoors · Apr 27 – May 11
PotatoesPlant outdoors · May 4 – May 18
LettuceSow outdoors · Apr 27 – May 11
Carrots, beetsSow outdoors · May 4 – May 18
TomatoesStart indoors · Mar 30 – Apr 13
TomatoesTransplant · Jun 1 – Jun 15
Peppers, eggplantStart indoors · Mar 16 – Mar 30
Peppers, eggplantTransplant · Jun 8 – Jun 22
BeansSow outdoors · Jun 1 – Jun 15
Sweet cornSow outdoors · Jun 1 – Jun 15
Cucumbers, squashSow outdoors · Jun 1 – Jun 15
Fall lettuce, spinachSow outdoors · Jul 21 – Aug 4
GarlicPlant cloves · Sep 1 – Oct 6
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 25) and first fall frost (Sep 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 97819 came on Mar 29 — 12 days earlier than the 1991–2020 average (Apr 10).

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 6b in Oregon

613 plants native to the lower 48 states, recorded in Oregon, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. Each links to its USDA PLANTS profile.

Trees 40

Alaska cedar75 ft · blooms mid spring · low shade tolerance · to −22 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fbigleaf maple60 ft · blooms mid spring · medium shade tolerance · to −14 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °FBrewer spruce100 ft · blooms early summer · low shade tolerance · to −13 °F

Shrubs 114

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °Fbeaked hazelnut15 ft · blooms early spring · low shade tolerance · to −47 °Fbig sagebrush4 ft · blooms mid summer · high shade tolerance · to −43 °F

Wildflowers & perennials 287

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °F

Grasses 161

Alaska brome5 ft · blooms late spring · low shade tolerance · to −18 °FAlaska oniongrass3 ft · blooms mid spring · low shade tolerance · to −33 °Falkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °F

Vines 2

riverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fwestern white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °F

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 Bridgeport, OR.

Soil in Bridgeport, OR

The soil mapped at the center of ZIP 97819 is Virtue — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Virtue silt loam, 2 to 7 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 97819; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Bridgeport, OR

Summer high88 °Faverage high, July
Winter low20 °Faverage low, January
Hot days27days a year at 90 °F or more
Freezing nights191nights a year at 32 °F or less
Growing degree days1,993base 50 °F — the season’s usable heat
Longest day15 h 33 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)
Precipitation9.1 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 38 °F, low 20 °F 38°20° JanFebruary: average high 44 °F, low 23 °F 44°23° FebMarch: average high 54 °F, low 28 °F 54°28° MarApril: average high 61 °F, low 31 °F 61°31° AprMay: average high 70 °F, low 39 °F 70°39° MayJune: average high 77 °F, low 44 °F 77°44° JunJuly: average high 88 °F, low 49 °F 88°49° JulAugust: average high 88 °F, low 47 °F 88°47° AugSeptember: average high 79 °F, low 39 °F 79°39° SepOctober: average high 64 °F, low 30 °F 64°30° OctNovember: average high 48 °F, low 25 °F 48°25° NovDecember: average high 37 °F, low 20 °F 37°20° Dec

Precipitation by month inches

0″1″2″January: 0.70 in precipitation 0.7 JanFebruary: 0.59 in precipitation 0.6 FebMarch: 0.77 in precipitation 0.8 MarApril: 0.82 in precipitation 0.8 AprMay: 1.46 in precipitation 1.5 MayJune: 1.10 in precipitation 1.1 JunJuly: 0.55 in precipitation 0.6 JulAugust: 0.43 in precipitation 0.4 AugSeptember: 0.44 in precipitation 0.4 SepOctober: 0.62 in precipitation 0.6 OctNovember: 0.73 in precipitation 0.7 NovDecember: 0.85 in precipitation 0.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Baker City Municipal Airport, OR (25 mi away); precipitation: Baker City Municipal Airport, OR (25 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.

978376a
Hereford, OR · 15 mi
979056b
Durkee, OR · 16 mi
979036b
Brogan, OR · 17 mi
979086a
Ironside, OR · 19 mi
979077a
Huntington, OR · 21 mi
978146b
Baker City, OR · 21 mi
978846a
Unity, OR · 23 mi
979096b
Jamieson, OR · 27 mi

Oregon planting zones →

Questions about 97819

What planting zone is ZIP code 97819?

ZIP code 97819 (Bridgeport, OR) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Bridgeport, OR?

The median last spring frost (32 °F) near 97819 is May 25; after June 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Baker City Municipal Airport station.

When is the first frost in Bridgeport, OR?

The median first fall frost near 97819 is September 15, giving a median frost-free growing season of 111 days.

When should I plant tomatoes in 97819?

Start tomato seeds indoors around Mar 30 – Apr 13 and set transplants outside around Jun 1 – Jun 15, one to three weeks after the median last frost.

How much rain and snow does 97819 get?

About 9.1 inches of precipitation a year (NOAA 1991–2020 normals, Baker City Municipal Airport station).

How hot do summers get in Bridgeport, OR?

The average high peaks at 88 °F in July, with about 27 days a year at 90 °F or more.

What kind of soil does 97819 have?

The USDA soil survey maps Virtue at the center of ZIP 97819: silt loam, well drained, pH about 7.0 (neutral).

Did spring come early in Bridgeport, OR in 2026?

Spring leaf-out near 97819 came on Mar 29 in 2026, 12 days earlier than the 1991–2020 average (Apr 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Bridgeport, OR?

Long-day onions: the longest day near 97819 is 15 h 33 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 97819 change?

Yes. The 2012 USDA map put 97819 in zone 5b; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.