Frost dates for Prince Gallitzin State Park, Pennsylvania
Half of years have their last spring frost by May 10, but 1 year in 10 still frosts after May 28.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- May 28
- 1 year in 5
- May 24
- 3 years in 10
- May 19
- 2 years in 5
- May 14
- Half of years (the median)
- May 10
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- September 24
- 1 year in 5
- September 28
- 3 years in 10
- October 1
- 2 years in 5
- October 3
- Half of years (the median)
- October 5
- Growing season
- about 149 days
- Hardiness zone nearby
- 6a
- Summer days
- a usual high of about 27 °C80 °F
- Lettuce and spinach run to seed
- June to August, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
Month by month
- January
- high ~1 °C34 °F · low ~-9 °C16 °F · rain ~72 mm2.8 in
- February
- high ~3 °C37 °F · low ~-8 °C17 °F · rain ~62 mm2.5 in
- March
- high ~8 °C46 °F · low ~-4 °C24 °F · rain ~83 mm3.3 in
- April
- high ~16 °C60 °F · low ~1 °C34 °F · rain ~93 mm3.7 in
- May
- high ~21 °C70 °F · low ~7 °C45 °F · rain ~95 mm3.7 in
- June
- high ~26 °C78 °F · low ~12 °C54 °F · rain ~98 mm3.9 in
- July
- high ~28 °C82 °F · low ~14 °C58 °F · rain ~99 mm3.9 in
- August
- high ~27 °C80 °F · low ~14 °C56 °F · rain ~100 mm3.9 in
- September
- high ~23 °C74 °F · low ~9 °C49 °F · rain ~103 mm4.1 in
- October
- high ~16 °C62 °F · low ~3 °C38 °F · rain ~80 mm3.1 in
- November
- high ~10 °C49 °F · low ~-2 °C29 °F · rain ~74 mm2.9 in
- December
- high ~4 °C38 °F · low ~-6 °C22 °F · rain ~74 mm2.9 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Prince Gallitzin State Park station (listed by NOAA as Prince Gallitzin Sp, USC00367167), at 40.65, -78.56. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
15712, 15721, 15724, 15738, 15742, 15753, 15757, 15760, 15773, 16616, 16619, 16624…
+10 moreShow fewer
16627, 16636, 16639, 16640, 16645, 16646, 16656, 16668, 16680, 16692.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Philipsburg 2 S, PA, last frost by May 13
- Johnstown Cambria County Airport, PA, last frost by April 29
- Altoona Blair County Airport, PA, last frost by April 23
- State College, PA, last frost by April 20
- Putneyville 2 SE Dam, PA, last frost by May 10
- Schenley Lock, PA, last frost by April 21
Other stations in Pennsylvania.
- Shippensburg, PA, last frost by April 19
- Mckeesport, PA, last frost by May 2
- Confluence 1 SW Dam, PA, last frost by April 30
- Carlisle Wtp, PA, last frost by April 23
- Charleroi Lock, PA, last frost by April 13
- Franklin, PA, last frost by May 2
- Selinsgrove 2 S, PA, last frost by April 25
- Washington 3 NE, PA, last frost by April 24
When do I plant? · Where the dates come from
More ways Milpa can help
When do I plant? · What grows well together? · Plan my garden · What can I plant now? · Something wrong in the garden? · Keep a garden diary · Heard a tip?