The National Weather Service issued a freeze watch for Central Maryland, with a cold front expected to drop temperatures by 30-40 degrees Tuesday into Wednesday.
Lows could reach the upper 20s in outlying suburbs and at higher elevations, and the lower 30s in Baltimore. That could damage or kill vulnerable house plants and crops.
The freeze watch is in effect late Tuesday night through early Wednesday morning. Tuesday is forecast to start off in the 60s but fall throughout the day as a cold front passes through, bringing rain and storms.
In Baltimore City, the year’s last frost typically occurs by April 11 in nine years out of every 10, but there is still a 10 percent chance of frost on or after April 26 at BWI Airport, April 30 in Bel Air and May 4 in Westminster, according to the University of Maryland Extension.
On average, the season's last frost occurs March 26 in Baltimore, April 13 at BWI and April 21 in Westminster, making this possible freeze on the later side.
If possible, sensitive plants can be covered with blankets or other insulators to protect them from damage.
Last year, frost came as late as May 14, with a low of 34 degrees at BWI. But the last freeze there came April 4 last year.