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

Planting zone for 16679 — Six Mile Run, PA

ZIP code 16679 (Six Mile Run, Bedford 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 16679 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 Six Mile Run, 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 Six Mile Run, 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 — 12 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 16679

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 16679 came on Mar 22 — 13 days earlier than the 1991–2020 average (Apr 4).

average
Apr 42026
Mar 22

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 Six Mile Run, PA

The soil mapped at the center of ZIP 16679 is Buchanan — slightly decomposed plant material, moderately well drained.

TextureSlightly decomposed plant materialtop layer

pH4.3strongly acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter69%high

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classNot prime farmlandUSDA classification

Map unit: Buchanan cobbly loam, 15 to 25 percent slopes, extremely stony.

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 16679; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Six Mile Run, 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 19 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

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Altoona Blair Co. Airport, PA (12 mi away); precipitation: Saxton 1w, PA (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

166336b

Defiance, PA · 2 mi

166726b

Riddlesburg, PA · 3 mi

Wells Tannery, PA · 6 mi

166506b

Hopewell, PA · 6 mi

166746b

Robertsdale, PA · 6 mi

Pennsylvania planting zones →

Questions about 16679

What planting zone is ZIP code 16679?

ZIP code 16679 (Six Mile Run, 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 Six Mile Run, PA?

The median last spring frost (32 °F) near 16679 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 Six Mile Run, PA?

The median first fall frost near 16679 is October 21, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 16679?

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 16679 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 Six Mile Run, 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 16679 have?

The USDA soil survey maps Buchanan at the center of ZIP 16679: slightly decomposed plant material, moderately well drained, pH about 4.3 (strongly acidic).

Did spring come early in Six Mile Run, PA in 2026?

Spring leaf-out near 16679 came on Mar 22 in 2026, 13 days earlier than the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Six Mile Run, PA?

Long-day onions: the longest day near 16679 is 15 h 02 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).