The NFL released on Thursday the dates each team turned in to the league for offseason programs.

The Denver Broncos will open their offseason conditioning program April 21. Their first full-team, on-field offseason training activity will run from May 28-30 with the second going June 2-4 and the third June 16-19.

The team's mandatory minicamp -- the only section of the offseason work a player can be formally fined for missing -- will be June 10-12.

The Broncos have a major re-model underway at their suburban Dove Valley complex, including the construction of an indoor practice facility. But the outdoor playing fields are scheduled to be ready.

Per the league's collective bargaining agreement the offseason program can span nine weeks in all, in three "phases."

The first phase is two weeks and allows strength and conditioning work only. The second is three weeks and allows individual player instruction and drills with coaches. No team drills pitting offense against defense is allowed during this phase.

The third phase is the final four weeks of the offseason work and when the full team drills are allowed, but no live hitting is permitted.

Teams can also have a rookies-only minicamp in the first or second weekend following the draft. This year's draft is May 8-10. The Broncos have traditionally folded the rookies into their first OTA work in recent years.

"We can make plans and try to make some decisions about what we do right now," Broncos head coach John Fox said. "But until we get our hands on them and get to coach them, we'll still have some things to work out. We'll be ready to get to work when the offseason schedule kicks in and be ready to coach them up when the rules let us."