Last season’s “American Idol” runner-up Adam Lambert is extending the reach of his long-awaited Glam Nation Tour with a total of 40 concert dates...

Last season’s “American Idol” runner-up Adam Lambert is extending the reach of his long-awaited Glam Nation Tour with a total of 40 concert dates now on his summer schedule.

While the tour doesn’t officially begin until the first week of June, Lambert’s itinerary opens this weekend with a set at the radio-sponsored Wango Tango concert on May 15 in Los Angeles, CA. His routing for the season will keep him on the road through a September 18 show at Tropicana Field in St. Petersburg, FL.

When initial plans for the Glam Nation Tour were revealed, Lambert had just over a dozen concerts confirmed. Now his trek includes gigs on June 15 at Riverside Theatre in Milwaukee, WI; July 3 at the House of Blues in North Myrtle Beach, SC; July 17 at Paramount Theatre in Denver, CO;and August 19 at Cape Cod Melody Tent in Hyannis, MA.

Stops in two previously announced tour markets have also been extended to two-night stands. Lambert will perform to sold-out audiences on June 22-23 at Nokia Theatre Times Square in New York, NY, followed the next month by July 27-28 concerts at the OC Fair in Costa Mesa, CA.

Ticket sales have already started in select tour markets; the next round of onsales begins May 14 in other markets. Most ticket face values are below the $50 mark, according to current listings on Ticketmaster.com.

Select dates of the tour will feature support from guitarist Orianthi and Lambert’s former “Idol” competitor Allison Iraheta.

“I hope the audience will be able to escape for a few hours and fall into a world full of glam, drama and excitement,” Lambert said in a statement on his official Web site. “And I would love everyone to come away with a new appreciation for the music on my album.”

Lambert is touring behind his debut album, “For Your Entertainment,” released in November 2009. Since the record opened at No. 3 on the Billboard 200, it has sold more than 615,000 copies, according to an end-of-April report from USA Today.

Adam Lambert itinerary:
(Dates are subject to change.)

May 15 Los Angeles, CA KIIS FM Wango Tango
May 22 Mansfield, MA KISS 108 FM Concert
June 4 Wilkes-Barre, PA Kirby Center for Performing Arts
June 5 Sayreville, NJ Starland Ballroom
June 6 Fishkill, NY Dutchess Stadium
June 8 Toledo, OH The Omni
June 10 Council Bluffs, IA Stir Concert Cove
June 11 Mahnomen, MN Shooting Star Casino
June 12 Prior Lake, MN Mystic Lake Casino
June 14 Columbus, OH Lifestyle Communities Pavilion
June 15 Milwaukee, WI Riverside Theatre
June 17 Hammond, IN The Venue at Horseshoe Casino
June 18 Royal Oak, MI Royal Oak Music Theatre
June 19 Toronto, ON KISS 92.5 Wham Bam
June 22 – 23 New York, NY Nokia Theatre Times Square
June 24 Mashantucket, CT MGM Grand at Foxwoods
June 26 Atlantic City, NJ Borgata Event Center
June 27 Baltimore, MD Rams Head Live!
June 28 Washington, DC 9:30 Club
June 30 Norfolk, VA NorVa
July 2 Charlotte, NC Fillmore Charlotte
July 3 North Myrtle Beach, SC House of Blues
July 6 Knoxville, TN Tennessee Theatre
July 9 Cleveland, OH Allen Theatre
July 10 Louisville, KY The Kentucky Center for the Performing Arts
July 12 Chesaning, MI Chesaning Showboat Music Festival
July 13 Lansing, MI Common Ground Music Festival
July 15 Kansas City, MO The Midland
July 17 Denver, CO Paramount Theatre
July 19 Boise, ID Morrison Center for the Performing Arts
July 20 Seattle, WA Showbox SoDo
July 21 Portland, OR McMenamins Crystal Ballroom
July 23 San Francisco, CA Warfield Theatre
July 27 – 28 Costa Mesa, CA OC Fair
July 31 Las Vegas, NV Mandalay Bay Beach
August 13 Bethlehem, PA Bethlehem Musikfest
August 19 Hyannis, MA Cape Cod Melody Tent
August 20 Cohasset, MA South Shore Music Circus
September 4 Rockford, IL On the Waterfront Festival
September 18 St. Petersburg, FL Tropicana Field