The NFL on Friday announced the days for voluntary offseason workout programs for all 32 teams, as well as dates for the mandatory off-season mini-camp.
The Seahawks will begin their off-season program on April 18 and will host their mini-camp June 14-16.
The Seahawks will also have nine off-season OTAs (Organized Team Activities). The dates of those are: May 23-24, May 26, May 31, June 1, June 3, June 6-7, June 9.
A good explanation of all of this can be found here.
As the link notes: “As per Article 21 of the Collective Bargaining Agreement, each club’s official, voluntary nine-week offseason program is conducted in three phases: Phase One consists of the first two weeks of the program with activities limited to strength and conditioning and physical rehabilitation only.