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

Planting zone for 36671 — Mobile, AL

ZIP code 36671 (Mobile, Mobile County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is March 3 and the first fall frost November 25.

Where ZIP 36671 is

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.

Zone9a20 to 25 °F
Coldest night−6.7 to −3.9 °C
Last frostMar 3
First frostNov 25
2012 zone8b

Was 8b 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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Mobile, AL…

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 Mobile, AL

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 3median — 50% chance of a later frost
Safe for tender plantsMarch 21only 10% chance of frost after
First fall frostNovember 25median — 10% chance by Nov 8
Growing season268 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 13 and returns around December 14.

From the NOAA station Mobile, AL — 4 miles away, elevation 207 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 36671

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 20 – Feb 3
SpinachSow outdoors · Jan 20 – Feb 10
Broccoli, cabbageStart indoors · Dec 23 – Jan 6
Broccoli, cabbageTransplant · Feb 10 – Feb 24
Onion setsPlant outdoors · Feb 3 – Feb 17
PotatoesPlant outdoors · Feb 10 – Feb 24
LettuceSow outdoors · Feb 3 – Feb 17
Carrots, beetsSow outdoors · Feb 10 – Feb 24
TomatoesStart indoors · Jan 6 – Jan 20
TomatoesTransplant · Mar 10 – Mar 24
Peppers, eggplantStart indoors · Dec 23 – Jan 6
Peppers, eggplantTransplant · Mar 17 – Mar 31
BeansSow outdoors · Mar 10 – Mar 24
Sweet cornSow outdoors · Mar 10 – Mar 24
Cucumbers, squashSow outdoors · Mar 10 – Mar 24
Fall lettuce, spinachSow outdoors · Sep 30 – Oct 14
GarlicPlant cloves · Nov 11 – Dec 16
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 3) and first fall frost (Nov 25) 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 36671 came on Jan 11 — 16 days earlier than the 1991–2020 average (Jan 27).

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 9a in Alabama

582 plants native to the lower 48 states, recorded in Alabama, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. Each links to its USDA PLANTS profile.

Trees 84

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 °FAtlantic white cedar50 ft · blooms spring · medium shade tolerance · to −36 °F

Shrubs 133

Allegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Faloe yucca15 ft · blooms early summer · medium shade tolerance · to −1 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 178

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican spongeplant0.5 ft · blooms mid spring · high shade tolerance · to −24 °FAmerican water horehound1.8 ft · blooms early summer · low shade tolerance · to −38 °F

Grasses 162

American cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fbig cordgrass8 ft · blooms spring · high shade tolerance · to −3 °F

Vines 13

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °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 Mobile, AL.

Soil in Mobile, AL

The soil mapped at the center of ZIP 36671 is Notcher — fine sandy loam, moderately well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH5.0strongly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classprime farmlandUSDA classification

Map unit: Notcher fine sandy loam, 0 to 2 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 36671; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mobile, AL

Summer high91 °Faverage high, July
Winter low41 °Faverage low, January
Hot days78days a year at 90 °F or more
Freezing nights21nights a year at 32 °F or less
Growing degree days6,719base 50 °F — the season’s usable heat
Longest day14 h 08 mindaylight on June 21
Shortest day10 h 10 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation73.4 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 62 °F, low 41 °F 62°41° JanFebruary: average high 66 °F, low 44 °F 66°44° FebMarch: average high 72 °F, low 50 °F 72°50° MarApril: average high 78 °F, low 56 °F 78°56° AprMay: average high 85 °F, low 64 °F 85°64° MayJune: average high 89 °F, low 71 °F 89°71° JunJuly: average high 91 °F, low 73 °F 91°73° JulAugust: average high 91 °F, low 73 °F 91°73° AugSeptember: average high 88 °F, low 69 °F 88°69° SepOctober: average high 80 °F, low 58 °F 80°58° OctNovember: average high 70 °F, low 48 °F 70°48° NovDecember: average high 64 °F, low 43 °F 64°43° Dec

Precipitation by month inches

0″2″4″6″8″January: 5.99 in precipitation 6.0 JanFebruary: 4.76 in precipitation 4.8 FebMarch: 5.63 in precipitation 5.6 MarApril: 6.17 in precipitation 6.2 AprMay: 5.89 in precipitation 5.9 MayJune: 8.57 in precipitation 8.6 JunJuly: 7.03 in precipitation 7.0 JulAugust: 8.58 in precipitation 8.6 AugSeptember: 5.51 in precipitation 5.5 SepOctober: 4.40 in precipitation 4.4 OctNovember: 5.21 in precipitation 5.2 NovDecember: 5.62 in precipitation 5.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mobile, AL (4 mi away); precipitation: Mobile 2.6 Wnw, AL (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9a.

366339a
Mobile, AL · <1 mi
366409a
Mobile, AL · <1 mi
366419a
Mobile, AL · <1 mi
366609a
Mobile, AL · <1 mi
366709a
Mobile, AL · <1 mi
366859a
Mobile, AL · <1 mi
366899a
Mobile, AL · <1 mi
366099a
Mobile, AL · <1 mi

All 34 ZIP codes in Mobile → · Alabama planting zones →

Questions about 36671

What planting zone is ZIP code 36671?

ZIP code 36671 (Mobile, AL) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Mobile, AL?

The median last spring frost (32 °F) near 36671 is March 3; after March 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mobile station.

When is the first frost in Mobile, AL?

The median first fall frost near 36671 is November 25, giving a median frost-free growing season of 268 days.

When should I plant tomatoes in 36671?

Start tomato seeds indoors around Jan 6 – Jan 20 and set transplants outside around Mar 10 – Mar 24, one to three weeks after the median last frost.

How much rain and snow does 36671 get?

About 73.4 inches of precipitation a year (NOAA 1991–2020 normals, Mobile 2.6 Wnw station).

How hot do summers get in Mobile, AL?

The average high peaks at 91 °F in July, with about 78 days a year at 90 °F or more.

What kind of soil does 36671 have?

The USDA soil survey maps Notcher at the center of ZIP 36671: fine sandy loam, moderately well drained, pH about 5.0 (strongly acidic).

Did spring come early in Mobile, AL in 2026?

Spring leaf-out near 36671 came on Jan 11 in 2026, 16 days earlier than the 1991–2020 average (Jan 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mobile, AL?

Short-day onions: the longest day near 36671 is 14 h 08 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

Did the zone for 36671 change?

Yes. The 2012 USDA map put 36671 in zone 8b; the 2023 map puts it in zone 9a. The newer map uses 1991–2020 data and more weather stations.