Frost dates for Franklin Hcn, Pennsylvania
Half of years have their last spring frost by May 2 — but 1 year in 10 still frosts after May 20.
Every other site gives you one date. A frost date is not a date: it is a percentile from 30 years of records at a nearby weather station, and planting to the median means losing the crop in half of years. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
- Frost this late in 1 year in 10
- May 20
- 1 year in 5
- May 15
- 3 years in 10
- May 9
- 2 years in 5
- May 6
- Half of years (the median)
- May 2
First fall freeze
- Freeze this early in 1 year in 10
- October 8
- 1 year in 5
- October 14
- 3 years in 10
- October 17
- 2 years in 5
- October 20
- Half of years (the median)
- October 23
- Growing season
- about 171 days
- Hardiness zone nearby
- 6a
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, station Franklin Hcn (USC00363028), at 41.40, -79.83. These are that station's own records, unshifted. The further your garden is from it, the less exactly they describe your ground — the planner resolves the nearest station to your own ZIP and lowers its confidence with distance, rather than presenting one number as if it were measured in your yard.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a hundred metres away does not. No table can know that about your garden. Your own logged frosts eventually can.
ZIP codes nearest this station
16022, 16030, 16036, 16040, 16048, 16049, 16054, 16145, 16232, 16301, 16311, 16317, 16319, 16323, 16331, 16342, 16343, 16344, 16346, 16362, 16364, 16372, 16373, 16374.
What can I plant here, and when? →
Nearby stations
The nearest stations, and how their last-frost dates compare — the frost gradient across your area, which no single station shows.
- Mercer, PA — last frost by May 15
- Putneyville 2 Se Dam, PA — last frost by May 10
- Mosquito Creek Lake, OH — last frost by April 30
- Schenley Lock, PA — last frost by April 21
- Erie Intl Ap Hcn, PA — last frost by April 26
- Beaver Falls 1 Ne, PA — last frost by April 27
Other stations in Pennsylvania.
- Mckeesport, PA — last frost by May 2
- Prince Gallitzin Sp, PA — last frost by May 10
- Washington 3 Ne, PA — last frost by April 24
- Laurel Mtn, PA — last frost by April 26
- Johnstown Cambria Co Ap, PA — last frost by April 29
- Philipsburg 2 S, PA — last frost by May 13
- Altoona Blair Co Ap, PA — last frost by April 23
- State College Hcn, PA — last frost by April 20