SAN FRANCISCO -- The Giants' Randy Johnson won his 300th career game against the franchise that drafted him in 1985 but doffed his cap to only a smattering of rain-wary fans. On June 20, Johnson will receive a much larger reception for his historic achievement.

The Giants announced Tuesday the details for a pregame ceremony at AT&T Park that will honor Johnson's win 16 days prior, when he pitched six innings of one-run ball against the Nationals on June 4.

Before San Francisco plays the second of three games against the Texas Rangers, Johnson's family and teammates will be alongside fellow 300-game winners Nolan Ryan, Tom Seaver and Gaylord Perry to join in the celebration.

Johnson's milestone will also be recognized this week when the Giants finish their current road trip against the Arizona Diamondbacks, with whom Johnson won four straight Cy Young Awards from 1999 to 2002.

Johnson, who became the 24th pitcher to eclipse No. 300, lost in his first attempt at 301 Monday against the Florida Marlins. If he stays on turn in the Giants rotation, the 45-year-old lefty would be slated to start June 19 in the Giants-Rangers series opener.