When is the last frost in Delaware?

Across Delaware the last spring frost usually comes between April 4 and April 7, with the middle of the state's weather stations around April 7 (NOAA 1991–2020 climate normals).

When is the first frost in Delaware?

Across Delaware the first fall frost usually comes between November 1 and November 6, with the middle of the state's weather stations around November 4 (NOAA 1991–2020 climate normals).

Frost Dates for Delaware: Last Spring and First Fall Frost by Town

Frost dates in Delaware

Typical last spring frost and first fall frost for 7 weather stations across Delaware, from NOAA’s 1991–2020 climate normals.

Last spring frost

Apr 4 – Apr 7

Typical across Delaware (middle: Apr 7)

First fall frost

Nov 1 – Nov 6

Typical across Delaware (middle: Nov 4)

By town

Station	Last spring frost	First fall frost	Frost-free days
Dover	Apr 4	Nov 4	214
Georgetown Sussex County Airport	Apr 4	Nov 6	216
Greenwood 2 NE	Apr 11	Oct 30	202
Lewes	Mar 29	Nov 14	230
Newark Ag Farm	Apr 7	Nov 2	209
Wilmington New Castle County Airport	Apr 7	Nov 1	208
Wilmington Porter Rsch	Apr 7	Nov 4	211

Each date is the median: in half of years the frost comes earlier, in half later. Frost here means a low of 32°F or colder at the station. Low spots and valleys often frost a week or two earlier than these dates; hillsides and city centers later.

Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020. The Field almanac also shows how often frost comes early or late, and a reanalysis reading for your exact location.

Frost dates for every state