Frost dates for Mckeesport, 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 14
- 3 years in 10
- May 10
- 2 years in 5
- May 5
- Half of years (the median)
- May 2
First fall freeze
- Freeze this early in 1 year in 10
- October 1
- 1 year in 5
- October 6
- 3 years in 10
- October 11
- 2 years in 5
- October 15
- Half of years (the median)
- October 20
- Growing season
- about 170 days
- Hardiness zones nearby
- 6b, 7a
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, station Mckeesport (USC00365573), at 40.34, -79.86. 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
15012, 15018, 15020, 15025, 15028, 15033, 15034, 15035, 15037, 15038, 15045, 15047, 15062, 15063, 15067, 15072, 15083, 15085, 15087, 15088, 15089, 15102, 15104, 15106, 15110, 15112, 15116, 15120, 15122, 15129, 15131, 15132, 15133, 15135, 15136, 15137, 15139, 15140, 15142, 15145, 15146, 15147, 15148, 15201, 15202, 15203, 15204, 15205, 15206, 15207, 15208, 15209, 15210, 15211, 15212, 15213, 15214, 15215, 15216, 15217, 15218, 15219, 15220, 15221, 15222, 15223, 15224, 15225, 15226, 15227, 15228, 15229, 15232, 15233, 15234, 15235, 15236, 15237, 15238, 15239, 15241, 15243, 15260, 15290, 15332, 15412, 15428, 15432, 15438, 15448, 15473, 15477, 15479, 15482, 15483, 15492, 15601, 15611, 15612, 15615, 15616, 15617, 15623, 15625, 15626, 15631, 15632, 15633, 15634, 15635, 15636, 15637, 15639, 15640, 15642, 15644, 15647, 15660, 15663, 15665 and 12 more.
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.
- Washington 3 Ne, PA — last frost by April 24
- Schenley Lock, PA — last frost by April 21
- Laurel Mtn, PA — last frost by April 26
- Beaver Falls 1 Ne, PA — last frost by April 27
- Lake Lynn, WV — last frost by April 25
- Wheeling Ohio Co Ap, WV — last frost by April 23
Other stations in Pennsylvania.
- Confluence 1 Sw Dam, PA — last frost by April 30
- Putneyville 2 Se Dam, PA — last frost by May 10
- Johnstown Cambria Co Ap, PA — last frost by April 29
- Mercer, PA — last frost by May 15
- Prince Gallitzin Sp, PA — last frost by May 10
- Franklin Hcn, PA — last frost by May 2
- Altoona Blair Co Ap, PA — last frost by April 23
- Philipsburg 2 S, PA — last frost by May 13