Home > List of rides > United States > New Haven, Connecticut Look up on Google / Wikipedia New Haven Critical Mass meets the last Friday of every month at 5:30pm on the New Haven Green. Group numbers range from 30+ in winter and inclement weather to 150+ during the summer. Rides typically last 1-2 hours. Also check out the our Little Sister: Critical Mass Hamden which is on the 2nd Friday of the month. Other in the United States in Connecticut (articles only)