Seeing the release of the new hero Wrecking Ball, Overwatch will be Free-to-Play for PC players during the last weekend of July.
Starting at 11am Pacific Time July 26th all the way to the 11:59pm Pacific Time on the 30th, you'll be granted access to the full game with its roster of 28 heroes and 18 maps. Which includes the ability to level up, earn Loot Boxes, and unlock a variety of different customization options for hero looks and actions in-game. Time zone conversion below.
Any in-game progress made will be saved in case you decide to purchase Overwatch as long as you use the same Battle.net account. Overwatch can be download and played from Blizzard's Battle.net App.