Lazio have failed to break through against a resilient Frosinone and could have fallen behind against the Serie A new boys before the break.
The Biancocelesti, who have scored in their last 11 games at the Stadio Olimpico, threatened early on with Senad Lulic blazing a shot over for the hosts.
Felipe Anderson then went close for the home side as the Brazilian's strike from Marco Parolo's cross was saved by Nicola Leali.
Santiago Gentiletti also managed to miss from close range moments later, before Daniel Pavlovic's strike from the edge of the Lazio area was tipped away by Federico Marchetti.
Lazio continued to press for a breakthrough, with Danilo Cataldi being denied by Leali and Anderson's shot blocked by the Frosinone backline.
Filip Djordjevic squandered another chance to give the Roman outfit the lead as his close-range header was saved by Leali.
Six minutes before the break, Frosinone nearly took a shock lead as Luca Paganini was thwarted by Marchetti, but Lazio survived the scare to go in level.
Chris O'Keefe
