Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 35570 — Hamilton, AL

ZIP code 35570 (Hamilton, Marion County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 11 and the first fall frost October 27.

Where ZIP 35570 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.

Zone7b5 to 10 °F

Coldest night−15 to −12.2 °C

Last frostApr 11

First frostOct 27

2012 zone7b

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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Hamilton, 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 Hamilton, AL

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostApril 11median — 50% chance of a later frost

Safe for tender plantsApril 27only 10% chance of frost after

First fall frostOctober 27median — 10% chance by Oct 15

Growing season198 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 4.

From the NOAA station Hamilton 3 S, AL — 4 miles away, elevation 436 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 35570

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 28 – Mar 14

SpinachSow outdoors · Feb 28 – Mar 21

Broccoli, cabbageStart indoors · Jan 31 – Feb 14

Broccoli, cabbageTransplant · Mar 21 – Apr 4

Onion setsPlant outdoors · Mar 14 – Mar 28

PotatoesPlant outdoors · Mar 21 – Apr 4

LettuceSow outdoors · Mar 14 – Mar 28

Carrots, beetsSow outdoors · Mar 21 – Apr 4

TomatoesStart indoors · Feb 14 – Feb 28

TomatoesTransplant · Apr 18 – May 2

Peppers, eggplantStart indoors · Jan 31 – Feb 14

Peppers, eggplantTransplant · Apr 25 – May 9

BeansSow outdoors · Apr 18 – May 2

Sweet cornSow outdoors · Apr 18 – May 2

Cucumbers, squashSow outdoors · Apr 18 – May 2

Fall lettuce, spinachSow outdoors · Sep 1 – Sep 15

GarlicPlant cloves · Oct 13 – Nov 17

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 11) and first fall frost (Oct 27) 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 35570 came on Feb 16 — about the same time as the 1991–2020 average (Feb 16).

average
Feb 162026
Feb 16

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 7b in Alabama

526 plants native to the lower 48 states, recorded in Alabama, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. Each links to its USDA PLANTS profile.

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 Hamilton, AL.

Soil in Hamilton, AL

The soil mapped at the center of ZIP 35570 is Ora — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables

pH4.6strongly acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter2%moderate

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Ora silt loam, 2 to 6 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 35570; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hamilton, AL

Summer high92 °Faverage high, July

Winter low28 °Faverage low, January

Hot days78days a year at 90 °F or more

Freezing nights96nights a year at 32 °F or less

Growing degree days5,001base 50 °F — the season’s usable heat

Longest day14 h 26 mindaylight on June 21

Shortest day9 h 52 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation61.7 inper year, rain and melted snow

Snowfall1 inper year; 1 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hamilton 3 S, AL (4 mi away); precipitation: Hamilton 3 S, AL (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

355527b

Detroit, AL · 11 mi

355647b

Hackleburg, AL · 11 mi

355637b

Guin, AL · 13 mi

355437b

Bear Creek, AL · 14 mi

388768a

Tremont, MS · 14 mi

355447b

Beaverton, AL · 14 mi

Alabama planting zones →

Questions about 35570

What planting zone is ZIP code 35570?

ZIP code 35570 (Hamilton, AL) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Hamilton, AL?

The median last spring frost (32 °F) near 35570 is April 11; after April 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hamilton 3 S station.

When is the first frost in Hamilton, AL?

The median first fall frost near 35570 is October 27, giving a median frost-free growing season of 198 days.

When should I plant tomatoes in 35570?

Start tomato seeds indoors around Feb 14 – Feb 28 and set transplants outside around Apr 18 – May 2, one to three weeks after the median last frost.

How much rain and snow does 35570 get?

About 61.7 inches of precipitation a year and 1 inches of snowfall (NOAA 1991–2020 normals, Hamilton 3 S station).

How hot do summers get in Hamilton, AL?

The average high peaks at 92 °F in July, with about 78 days a year at 90 °F or more.

What kind of soil does 35570 have?

The USDA soil survey maps Ora at the center of ZIP 35570: silt loam, moderately well drained, pH about 4.6 (strongly acidic).

Did spring come early in Hamilton, AL in 2026?

Spring leaf-out near 35570 came on Feb 16 in 2026, about the same as the 1991–2020 average (Feb 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hamilton, AL?

Intermediate onions: the longest day near 35570 is 14 h 26 min, so day-neutral types bulb best; long-day varieties may not bulb fully.