Johnson threw two sets of flat-ground work Friday afternoon and will throw between 20-25 fastballs off a mound at the team's training facility at about 50-percent intensity.
His rehabilitation route and flat-ground work this spring have all gone according to plan and without a hiccup, Johnson said.
"It couldn't have gone any better," he said.
Johnson last pitched in a game on March 18 of last year in Spring Training before experiencing soreness in his elbow. Then, on April 24, Johnson had elbow reconstructive surgery -- the second time he has had the procedure. He also had Tommy John surgery in 2007.
Johnson signed with the Padres in the winter of 2013 for $8 million but his missed the entire season. The Padres declined his $4 million option after the season but brought him back on a one-year deal for $1 million, though the deal could potentially reach $7.25 million with incentives.
Johnson said he's excited to get back on a mound for the first time in a year.
"This is one of the ones you look forward to, one you circle on the calendar, even though I didn't know the date until about two weeks ago," he said. "… It's a big mark you can't wait to get to and check off."
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.