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

Planting zone for 97080 — Gresham, OR

ZIP code 97080 (Gresham, Multnomah County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 16 and the first fall frost November 20.

Where ZIP 97080 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.

Zone8b15 to 20 °F
Coldest night−9.4 to −6.7 °C
Last frostMar 16
First frostNov 20
2012 zone8b

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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Gresham, 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 Gresham, OR

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 16median — 50% chance of a later frost
Safe for tender plantsApril 12only 10% chance of frost after
First fall frostNovember 20median — 10% chance by Oct 30
Growing season250 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 14 and returns around December 15.

From the NOAA station Portland Troutdale Airport, OR — 5 miles away, elevation 30 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 97080

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 2 – Feb 16
SpinachSow outdoors · Feb 2 – Feb 23
Broccoli, cabbageStart indoors · Jan 5 – Jan 19
Broccoli, cabbageTransplant · Feb 23 – Mar 9
Onion setsPlant outdoors · Feb 16 – Mar 2
PotatoesPlant outdoors · Feb 23 – Mar 9
LettuceSow outdoors · Feb 16 – Mar 2
Carrots, beetsSow outdoors · Feb 23 – Mar 9
TomatoesStart indoors · Jan 19 – Feb 2
TomatoesTransplant · Mar 23 – Apr 6
Peppers, eggplantStart indoors · Jan 5 – Jan 19
Peppers, eggplantTransplant · Mar 30 – Apr 13
BeansSow outdoors · Mar 23 – Apr 6
Sweet cornSow outdoors · Mar 23 – Apr 6
Cucumbers, squashSow outdoors · Mar 23 – Apr 6
Fall lettuce, spinachSow outdoors · Sep 25 – Oct 9
GarlicPlant cloves · Nov 6 – Dec 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 16) and first fall frost (Nov 20) 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 97080 came on Feb 8 — 12 days earlier than the 1991–2020 average (Feb 20).

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.

Trees 43

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 132

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 305

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 166

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 Gresham, OR.

Soil in Gresham, OR

The soil mapped at the center of ZIP 97080 is Powell — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.6moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter5%high
Hydrologic groupDwater soaks in very slowly
Farmland classPrime farmland if drainedUSDA classification

Map unit: Powell silt loam, 3 to 8 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 97080; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Gresham, OR

Summer high82 °Faverage high, July
Winter low37 °Faverage low, January
Hot days16days a year at 90 °F or more
Freezing nights28nights a year at 32 °F or less
Growing degree days2,697base 50 °F — the season’s usable heat
Longest day15 h 41 mindaylight on June 21
Shortest day8 h 42 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation55.3 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°32 °FJanuary: average high 47 °F, low 37 °F 47°37° JanFebruary: average high 51 °F, low 38 °F 51°38° FebMarch: average high 57 °F, low 40 °F 57°40° MarApril: average high 62 °F, low 43 °F 62°43° AprMay: average high 69 °F, low 49 °F 69°49° MayJune: average high 74 °F, low 53 °F 74°53° JunJuly: average high 82 °F, low 57 °F 82°57° JulAugust: average high 82 °F, low 57 °F 82°57° AugSeptember: average high 76 °F, low 52 °F 76°52° SepOctober: average high 64 °F, low 46 °F 64°46° OctNovember: average high 53 °F, low 42 °F 53°42° NovDecember: average high 46 °F, low 37 °F 46°37° Dec

Precipitation by month inches

0″2″4″6″8″January: 7.21 in precipitation 7.2 JanFebruary: 5.30 in precipitation 5.3 FebMarch: 6.49 in precipitation 6.5 MarApril: 5.33 in precipitation 5.3 AprMay: 3.97 in precipitation 4.0 MayJune: 3.15 in precipitation 3.1 JunJuly: 0.73 in precipitation 0.7 JulAugust: 0.71 in precipitation 0.7 AugSeptember: 1.92 in precipitation 1.9 SepOctober: 4.65 in precipitation 4.7 OctNovember: 7.61 in precipitation 7.6 NovDecember: 8.20 in precipitation 8.2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Portland Troutdale Airport, OR (5 mi away); precipitation: Boring 0.6 Wsw, OR (4 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.

970309a
Gresham, OR · 3 mi
970609a
Troutdale, OR · 4 mi
970898b
Damascus, OR · 4 mi
970098b
Boring, OR · 5 mi
970249a
Fairview, OR · 5 mi
972369a
Portland, OR · 6 mi
972339a
Portland, OR · 6 mi
970868b
Happy Valley, OR · 7 mi

All 2 ZIP codes in Gresham → · Oregon planting zones →

Questions about 97080

What planting zone is ZIP code 97080?

ZIP code 97080 (Gresham, OR) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Gresham, OR?

The median last spring frost (32 °F) near 97080 is March 16; after April 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Portland Troutdale Airport station.

When is the first frost in Gresham, OR?

The median first fall frost near 97080 is November 20, giving a median frost-free growing season of 250 days.

When should I plant tomatoes in 97080?

Start tomato seeds indoors around Jan 19 – Feb 2 and set transplants outside around Mar 23 – Apr 6, one to three weeks after the median last frost.

How much rain and snow does 97080 get?

About 55.3 inches of precipitation a year (NOAA 1991–2020 normals, Boring 0.6 Wsw station).

How hot do summers get in Gresham, OR?

The average high peaks at 82 °F in July, with about 16 days a year at 90 °F or more.

What kind of soil does 97080 have?

The USDA soil survey maps Powell at the center of ZIP 97080: silt loam, somewhat poorly drained, pH about 5.6 (moderately acidic).

Did spring come early in Gresham, OR in 2026?

Spring leaf-out near 97080 came on Feb 8 in 2026, 12 days earlier than the 1991–2020 average (Feb 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Gresham, OR?

Long-day onions: the longest day near 97080 is 15 h 41 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).