The best time to catch blue crabs is usually within one to two hours of high tide because crabs often move in and out with the tide. To determine when high tide is, crabbers can consult a tide chart for the local area.
The best time of year to catch blue crabs is when the water temperature is between 70 and 75 degrees Fahrenheit. Crabs tend to be more active in warm waters and may become dormant if the water temperature is lower than 60 degrees Fahrenheit.
Crabbers should check local laws before crabbing because there may be rules and regulations in place that limit the times of day, seasons and locations where crabbing can be done.