The YRFC field is located at 70 Central Ave, New Haven, CT 06515, just off the Derby Avenue

From Yale:

A bus runs from Payne Whitney Gymnasium to Smilow Field House every 15 minutes during the week and every 30 minutes on the weekends. From the field house, walk across the road behind Coxe Cage and the tennis center towards the intramural fields. You can't miss it.

By Car:

From 91 take Exit 1 to downtown New Haven, Route 34. Follow route 34 through New Haven and into West Haven. When you enter West Haven you will pass Yale Field on the left and the Smilow Field House on the right. 1/4 of a mile past the Field House, make a right on to Central Avenue (just past Giardano Bros. funeral parlor). You cant miss it. Look for the Yale rugby sign.