38.8951°N/77.0364°W
When to plant in Washington
District of Columbia, United States · Humid subtropical (Köppen Cfa)
Last spring frost · safe
Apr 7
~10% frost risk · typical Mar 24
First fall frost · safe
Nov 4
~10% frost risk · typical Nov 17
Frost-free days
234
Mar 24 → Nov 17
Climate zone
Humid subtropical
Köppen Cfa
89/100 confidence
◇ Station-based
The frost date shown is the safe date (~10% frost risk); the typical median is shown alongside. Your microclimate can shift things ±1–2 weeks.
The growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
GROWING SEASON — 234 DAYS
MAR 24
NOV 17
Full crop calendar
Same climate — Humid subtropical
Source: Curated · based on NOAA GHCN-Daily 1991–2020 normal · Köppen–Geiger classification (Beck et al. 2023) · crop windows from FAO ECOCROP references. How we calculate this →
Also see frost dates for Washington.