Here's what the local cycling club says about terrain

Terrain: Abbreviations are used in the ride descriptions to describe how flat or hilly a ride is. Note that these ratings are approximate, and are an average for a ride –some rides have long flat segments along with some very hilly segments.
Code Description Feet of Climbing/Mile

F Flat route < 10
F/R Flat to Rolling 11-20
gR generally Rolling 21-30
RH Rolling to Hilly 31-45
sH somewhat Hillier 46-60
VH Very Hilly > 60

Around the block for me is 7.7 miles with 407 feet of climbing and a max.grade of 6.2% (a short stretch.)