Frost dates for Storrs Hcn, Connecticut
Half of years have their last spring frost by April 19 — but 1 year in 10 still frosts after May 3.
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 3
- 1 year in 5
- April 29
- 3 years in 10
- April 25
- 2 years in 5
- April 22
- Half of years (the median)
- April 19
First fall freeze
- Freeze this early in 1 year in 10
- October 6
- 1 year in 5
- October 11
- 3 years in 10
- October 15
- 2 years in 5
- October 19
- Half of years (the median)
- October 22
- Growing season
- about 186 days
- Hardiness zones nearby
- 6a, 6b
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, station Storrs Hcn (USC00068138), at 41.80, -72.23. 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
01521, 06029, 06071, 06076, 06084, 06226, 06231, 06232, 06235, 06237, 06238, 06242, 06247, 06248, 06249, 06250, 06254, 06256, 06264, 06266, 06268, 06269, 06278, 06279, 06280, 06282, 06330, 06331, 06334, 06336, 06350, 06360, 06380, 06389, 06415, 06420.
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.
- Hartford Brainard Fld, CT — last frost by April 17
- N Foster 1 E, RI — last frost by April 25
- Belchertown, MA — last frost by May 3
- Westfield Barnes Muni Ap, MA — last frost by May 3
- Worcester Rgnl Ap, MA — last frost by April 23
- Westerly State Ap, RI — last frost by April 11
Other stations in Connecticut.
- Bakersville, CT — last frost by May 8
- New Haven Tweed Ap, CT — last frost by April 17
- Bridgeport Sikorsky Mem Ap, CT — last frost by April 5