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

Planting zone for 97530 — Jacksonville, OR

ZIP code 97530 (Jacksonville, Jackson County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is May 4 and the first fall frost October 13.

Where ZIP 97530 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.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostMay 4
First frostOct 13
2012 zone8a

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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Jacksonville, 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 Jacksonville, OR

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 4median — 50% chance of a later frost
Safe for tender plantsMay 23only 10% chance of frost after
First fall frostOctober 13median — 10% chance by Sep 22
Growing season160 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 6 and returns around November 1.

From the NOAA station Ruch, OR — 7 miles away, elevation 1,549 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 97530

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 23 – Apr 6
SpinachSow outdoors · Mar 23 – Apr 13
Broccoli, cabbageStart indoors · Feb 23 – Mar 9
Broccoli, cabbageTransplant · Apr 13 – Apr 27
Onion setsPlant outdoors · Apr 6 – Apr 20
PotatoesPlant outdoors · Apr 13 – Apr 27
LettuceSow outdoors · Apr 6 – Apr 20
Carrots, beetsSow outdoors · Apr 13 – Apr 27
TomatoesStart indoors · Mar 9 – Mar 23
TomatoesTransplant · May 11 – May 25
Peppers, eggplantStart indoors · Feb 23 – Mar 9
Peppers, eggplantTransplant · May 18 – Jun 1
BeansSow outdoors · May 11 – May 25
Sweet cornSow outdoors · May 11 – May 25
Cucumbers, squashSow outdoors · May 11 – May 25
Fall lettuce, spinachSow outdoors · Aug 18 – Sep 1
GarlicPlant cloves · Sep 29 – Nov 3
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 4) and first fall frost (Oct 13) 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 97530 came on Feb 4 — 26 days earlier than the 1991–2020 average (Mar 2).

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 8a in Oregon

654 plants native to the lower 48 states, recorded in Oregon, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. Each links to its USDA PLANTS profile.

Trees 41

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 129

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 303

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 Jacksonville, OR.

Soil in Jacksonville, OR

The soil mapped at the center of ZIP 97530 is Vannoy — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer
pH6.0slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter75%high
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Vannoy silt loam, 35 to 75 percent north slopes, MLRA 5.

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 97530; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Jacksonville, OR

Summer high92 °Faverage high, July
Winter low30 °Faverage low, January
Hot days65days a year at 90 °F or more
Freezing nights103nights a year at 32 °F or less
Growing degree days2,844base 50 °F — the season’s usable heat
Longest day15 h 15 mindaylight on June 21
Shortest day9 h 06 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation25.9 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 50 °F, low 30 °F 50°30° JanFebruary: average high 55 °F, low 31 °F 55°31° FebMarch: average high 60 °F, low 33 °F 60°33° MarApril: average high 65 °F, low 36 °F 65°36° AprMay: average high 75 °F, low 42 °F 75°42° MayJune: average high 82 °F, low 47 °F 82°47° JunJuly: average high 92 °F, low 52 °F 92°52° JulAugust: average high 91 °F, low 51 °F 91°51° AugSeptember: average high 85 °F, low 45 °F 85°45° SepOctober: average high 72 °F, low 38 °F 72°38° OctNovember: average high 56 °F, low 33 °F 56°33° NovDecember: average high 49 °F, low 30 °F 49°30° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.90 in precipitation 3.9 JanFebruary: 3.21 in precipitation 3.2 FebMarch: 2.56 in precipitation 2.6 MarApril: 2.10 in precipitation 2.1 AprMay: 1.61 in precipitation 1.6 MayJune: 0.85 in precipitation 0.8 JunJuly: 0.36 in precipitation 0.4 JulAugust: 0.41 in precipitation 0.4 AugSeptember: 0.56 in precipitation 0.6 SepOctober: 1.85 in precipitation 1.9 OctNovember: 3.32 in precipitation 3.3 NovDecember: 5.18 in precipitation 5.2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ruch, OR (7 mi away); precipitation: Jacksonville 10 S, OR (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

975448b
Williams, OR · 11 mi
975018b
Medford, OR · 15 mi
975408a
Talent, OR · 16 mi
960868b
Seiad Valley, CA · 17 mi
975358b
Phoenix, OR · 18 mi
975258b
Gold Hill, OR · 20 mi
975028b
Central Point, OR · 20 mi
975048b
Medford, OR · 21 mi

Oregon planting zones →

Questions about 97530

What planting zone is ZIP code 97530?

ZIP code 97530 (Jacksonville, OR) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Jacksonville, OR?

The median last spring frost (32 °F) near 97530 is May 4; after May 23 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ruch station.

When is the first frost in Jacksonville, OR?

The median first fall frost near 97530 is October 13, giving a median frost-free growing season of 160 days.

When should I plant tomatoes in 97530?

Start tomato seeds indoors around Mar 9 – Mar 23 and set transplants outside around May 11 – May 25, one to three weeks after the median last frost.

How much rain and snow does 97530 get?

About 25.9 inches of precipitation a year (NOAA 1991–2020 normals, Jacksonville 10 S station).

How hot do summers get in Jacksonville, OR?

The average high peaks at 92 °F in July, with about 65 days a year at 90 °F or more.

What kind of soil does 97530 have?

The USDA soil survey maps Vannoy at the center of ZIP 97530: slightly decomposed plant material, well drained, pH about 6.0 (slightly acidic).

Did spring come early in Jacksonville, OR in 2026?

Spring leaf-out near 97530 came on Feb 4 in 2026, 26 days earlier than the 1991–2020 average (Mar 2), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Jacksonville, OR?

Long-day onions: the longest day near 97530 is 15 h 15 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).