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

Planting zone for 16634 — Dudley, PA

ZIP code 16634 (Dudley, Huntingdon County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 23 and the first fall frost October 21.

Where ZIP 16634 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostApr 23
First frostOct 21
2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Dudley, PA…

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 Dudley, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 23median — 50% chance of a later frost
Safe for tender plantsMay 11only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 5
Growing season177 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 11 and returns around November 1.

From the NOAA station Altoona Blair Co. Airport, PA — 10 miles away, elevation 1,480 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 16634

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 12 – Mar 26
SpinachSow outdoors · Mar 12 – Apr 2
Broccoli, cabbageStart indoors · Feb 12 – Feb 26
Broccoli, cabbageTransplant · Apr 2 – Apr 16
Onion setsPlant outdoors · Mar 26 – Apr 9
PotatoesPlant outdoors · Apr 2 – Apr 16
LettuceSow outdoors · Mar 26 – Apr 9
Carrots, beetsSow outdoors · Apr 2 – Apr 16
TomatoesStart indoors · Feb 26 – Mar 12
TomatoesTransplant · Apr 30 – May 14
Peppers, eggplantStart indoors · Feb 12 – Feb 26
Peppers, eggplantTransplant · May 7 – May 21
BeansSow outdoors · Apr 30 – May 14
Sweet cornSow outdoors · Apr 30 – May 14
Cucumbers, squashSow outdoors · Apr 30 – May 14
Fall lettuce, spinachSow outdoors · Aug 26 – Sep 9
GarlicPlant cloves · Oct 7 – Nov 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 23) and first fall frost (Oct 21) 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 16634 came on Mar 23 — 12 days earlier than the 1991–2020 average (Apr 4).

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).

Soil in Dudley, PA

The soil mapped at the center of ZIP 16634 is Clymer — channery loam, well drained.

TextureChannery loama good balance for most vegetables
pH4.6strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Clymer very stony loam, 8 to 15 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 16634; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Dudley, PA

Summer high83 °Faverage high, July
Winter low21 °Faverage low, January
Hot days8days a year at 90 °F or more
Freezing nights118nights a year at 32 °F or less
Growing degree days2,977base 50 °F — the season’s usable heat
Longest day15 h 02 mindaylight on June 21
Shortest day9 h 18 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation41.1 inper year, rain and melted snow
Snowfall23 inper year; 21 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 36 °F, low 21 °F 36°21° JanFebruary: average high 39 °F, low 23 °F 39°23° FebMarch: average high 48 °F, low 30 °F 48°30° MarApril: average high 61 °F, low 40 °F 61°40° AprMay: average high 71 °F, low 50 °F 71°50° MayJune: average high 79 °F, low 58 °F 79°58° JunJuly: average high 83 °F, low 62 °F 83°62° JulAugust: average high 81 °F, low 60 °F 81°60° AugSeptember: average high 74 °F, low 53 °F 74°53° SepOctober: average high 63 °F, low 43 °F 63°43° OctNovember: average high 51 °F, low 34 °F 51°34° NovDecember: average high 40 °F, low 26 °F 40°26° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.88 in precipitation, 5.7 in snowfall 2.9❄6 JanFebruary: 2.38 in precipitation, 8.5 in snowfall 2.4❄9 FebMarch: 3.60 in precipitation, 2.3 in snowfall 3.6❄2 MarApril: 3.68 in precipitation 3.7 AprMay: 4.03 in precipitation 4.0 MayJune: 3.67 in precipitation 3.7 JunJuly: 4.47 in precipitation 4.5 JulAugust: 3.21 in precipitation 3.2 AugSeptember: 3.70 in precipitation 3.7 SepOctober: 3.30 in precipitation, 0.6 in snowfall 3.3❄1 OctNovember: 3.07 in precipitation, 0.2 in snowfall 3.1 NovDecember: 3.15 in precipitation, 5.5 in snowfall 3.1❄6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Altoona Blair Co. Airport, PA (10 mi away); precipitation: Saxton 1w, PA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

166946b
Wood, PA · 2 mi
166786b
Saxton, PA · 3 mi
166726b
Riddlesburg, PA · 4 mi
166796b
Six Mile Run, PA · 4 mi
166336b
Defiance, PA · 5 mi
166216b
Broad Top, PA · 5 mi
166746b
Robertsdale, PA · 5 mi
166856b
Todd, PA · 7 mi

Pennsylvania planting zones →

Questions about 16634

What planting zone is ZIP code 16634?

ZIP code 16634 (Dudley, PA) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Dudley, PA?

The median last spring frost (32 °F) near 16634 is April 23; after May 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Altoona Blair Co. Airport station.

When is the first frost in Dudley, PA?

The median first fall frost near 16634 is October 21, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 16634?

Start tomato seeds indoors around Feb 26 – Mar 12 and set transplants outside around Apr 30 – May 14, one to three weeks after the median last frost.

How much rain and snow does 16634 get?

About 41.1 inches of precipitation a year and 23 inches of snowfall (NOAA 1991–2020 normals, Saxton 1w station).

How hot do summers get in Dudley, PA?

The average high peaks at 83 °F in July, with about 8 days a year at 90 °F or more.

What kind of soil does 16634 have?

The USDA soil survey maps Clymer at the center of ZIP 16634: channery loam, well drained, pH about 4.6 (strongly acidic).

Did spring come early in Dudley, PA in 2026?

Spring leaf-out near 16634 came on Mar 23 in 2026, 12 days earlier than the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Dudley, PA?

Long-day onions: the longest day near 16634 is 15 h 02 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).