The mothership SB Nation tells is that as of mid-June in 2015, 446 players were signed as undrafted free agents to NFL rosters. Some years, it can be higher (the same time in 2013 saw 622 UDFAs sign contracts with teams). As is the case in most years, the majority of the 2015 UDFA class did not stay on rosters. Per CBS Sports, about 1 in 6 UDFAs can expect to earn spots on the Week 1 rosters, and perhaps that many other such players find spots on teams’ practice squads. However, those numbers are averages. Some years, a single team might see just a handful of UDFAs crack the roster, whereas in other years (or on other teams), it might be double digits for a single UDFA class.
Ryan Pace’s 2015 UDFA Class: Midterms
