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

Planting zone for 04469 — Orono, ME

ZIP code 04469 (Orono, Penobscot County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 1 and the first fall frost October 6.

Where ZIP 04469 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.

Zone5a−20 to −15 °F
Coldest night−28.9 to −26.1 °C
Last frostMay 1
First frostOct 6
2012 zone5a

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 5a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Orono, ME…

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 Orono, ME

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 1median — 50% chance of a later frost
Safe for tender plantsMay 14only 10% chance of frost after
First fall frostOctober 6median — 10% chance by Sep 24
Growing season157 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 20 and returns around October 20.

From the NOAA station Orono, ME — within 1 mile, elevation 115 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 04469

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 20 – Apr 3
SpinachSow outdoors · Mar 20 – Apr 10
Broccoli, cabbageStart indoors · Feb 20 – Mar 6
Broccoli, cabbageTransplant · Apr 10 – Apr 24
Onion setsPlant outdoors · Apr 3 – Apr 17
PotatoesPlant outdoors · Apr 10 – Apr 24
LettuceSow outdoors · Apr 3 – Apr 17
Carrots, beetsSow outdoors · Apr 10 – Apr 24
TomatoesStart indoors · Mar 6 – Mar 20
TomatoesTransplant · May 8 – May 22
Peppers, eggplantStart indoors · Feb 20 – Mar 6
Peppers, eggplantTransplant · May 15 – May 29
BeansSow outdoors · May 8 – May 22
Sweet cornSow outdoors · May 8 – May 22
Cucumbers, squashSow outdoors · May 8 – May 22
Fall lettuce, spinachSow outdoors · Aug 11 – Aug 25
GarlicPlant cloves · Sep 22 – Oct 27
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 1) and first fall frost (Oct 6) 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 04469 came on Apr 17 — 7 days earlier than the 1991–2020 average (Apr 24).

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 5a in Maine

483 plants native to the lower 48 states, recorded in Maine, and rated by the USDA to survive −20 °F or colder — the bottom of zone 5a. Each links to its USDA PLANTS profile.

Trees 53

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 96

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falpine bearberry0.5 ft · blooms early spring · medium shade tolerance · to −62 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °F

Wildflowers & perennials 166

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °F

Grasses 151

alpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °F

Vines 6

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °FVirginia creeper1 ft · blooms late spring · medium shade tolerance · to −28 °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 Orono, ME.

Soil in Orono, ME

The soil mapped at the center of ZIP 04469 is Pushaw — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter6%high
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Pushaw-Swanville-Urban land association, 0 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 04469; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Orono, ME

Summer high81 °Faverage high, July
Winter low11 °Faverage low, January
Hot days9days a year at 90 °F or more
Freezing nights164nights a year at 32 °F or less
Growing degree days2,094base 50 °F — the season’s usable heat
Longest day15 h 36 mindaylight on June 21
Shortest day8 h 47 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation44.4 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 28 °F, low 11 °F 28°11° JanFebruary: average high 32 °F, low 13 °F 32°13° FebMarch: average high 41 °F, low 21 °F 41°21° MarApril: average high 53 °F, low 32 °F 53°32° AprMay: average high 66 °F, low 43 °F 66°43° MayJune: average high 75 °F, low 52 °F 75°52° JunJuly: average high 81 °F, low 58 °F 81°58° JulAugust: average high 79 °F, low 57 °F 79°57° AugSeptember: average high 70 °F, low 48 °F 70°48° SepOctober: average high 57 °F, low 38 °F 57°38° OctNovember: average high 45 °F, low 29 °F 45°29° NovDecember: average high 35 °F, low 18 °F 35°18° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.66 in precipitation 3.7 JanFebruary: 2.98 in precipitation 3.0 FebMarch: 3.78 in precipitation 3.8 MarApril: 3.68 in precipitation 3.7 AprMay: 3.47 in precipitation 3.5 MayJune: 4.19 in precipitation 4.2 JunJuly: 3.45 in precipitation 3.5 JulAugust: 3.15 in precipitation 3.1 AugSeptember: 3.67 in precipitation 3.7 SepOctober: 4.27 in precipitation 4.3 OctNovember: 3.99 in precipitation 4.0 NovDecember: 4.15 in precipitation 4.2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Orono, ME (within 1 mile); precipitation: Old Town 2 W, ME (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5a.

044895a
Stillwater, ME · 1 mi
044735a
Orono, ME · 4 mi
044115a
Bradley, ME · 6 mi
044615a
Milford, ME · 8 mi
044285a
Eddington, ME · 9 mi
044125a
Brewer, ME · 9 mi
044025a
Bangor, ME · 9 mi
044685a
Old Town, ME · 9 mi

All 2 ZIP codes in Orono → · Maine planting zones →

Questions about 04469

What planting zone is ZIP code 04469?

ZIP code 04469 (Orono, ME) is in USDA hardiness zone 5a on the 2023 map: the coldest night of an average winter reaches −20 to −15 °F (−28.9 to −26.1 °C).

When is the last frost in Orono, ME?

The median last spring frost (32 °F) near 04469 is May 1; after May 14 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Orono station.

When is the first frost in Orono, ME?

The median first fall frost near 04469 is October 6, giving a median frost-free growing season of 157 days.

When should I plant tomatoes in 04469?

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

How much rain and snow does 04469 get?

About 44.4 inches of precipitation a year (NOAA 1991–2020 normals, Old Town 2 W station).

How hot do summers get in Orono, ME?

The average high peaks at 81 °F in July, with about 9 days a year at 90 °F or more.

What kind of soil does 04469 have?

The USDA soil survey maps Pushaw at the center of ZIP 04469: silt loam, somewhat poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Orono, ME in 2026?

Spring leaf-out near 04469 came on Apr 17 in 2026, 7 days earlier than the 1991–2020 average (Apr 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Orono, ME?

Long-day onions: the longest day near 04469 is 15 h 36 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).