Here it is...Mahler in the US for the 2015/2016 concert season. I've only included the larger orchestras. No community, college, or non-professional groups. Also, only groups that had their seasons listed. If there are omissions, let me know.
It is indeed possible to hear all of the symphonies again next season. What's really special is the Dallas performance of Das klagende Lied, although I don't think they're doing the Waldmarchen. The 7th I can only find once - last year it seemed everyone was doing it. So if you're motivated, have the time and the wallet, go for it! For people like me who love the instrumental symphonies Utah is the place to be.
I did not include any 2015 summer concert festivals for a good reason: most of them are outdoors and most of those use electronic amplification. Why? If I want to listen to speakers I'll stay home, pour some Maker's Mark and crank up the stereo. To hear the Mahler palette requires a good hall. Grand Tetons has a wonderful hall, and they're doing DLVDE this summer!
Mahler in the USA 2015-2016
Das Klagende Lied
Dallas May 27, 28 2016
Symphony 1
Los Angeles Jan 29-31 2016
Seattle Sept 24, 26 2015
Dallas (w/Blumine) Oct 1-4 2015
Kansas City Apr 2-4 2016
Boston Mar 31-Apr 5 2016
San Antonio Jun 4 2016
Grand Rapids Oct 23, 24 2015
Symphony 2
San Francisco Jun 20-Jul 2 2016
Colorado Feb 19, 20 2016
Detroit Dec 5,6 2015
Tulsa Mar 12 2016 (B Zander on the podium)
Symphony 3
Los Angeles Mar 3-6 2016
Oregon May 21, 23 2016
Cleveland Oct 1,2 2015
Symphony 4
St Louis Apr 2,3 2016
Chicago Apr 14-16 2016
Indianapolis Oct 31 2015
Minnesota Oct 1-4 2015
Symphony 5
Utah Nov 6,7 2015
Houston Sept 17-20 2015
St Louis Jan 22, 23 2016
Minnesota June 9-11 2016
New York Sep 24-26
Baltimore Apr 5 2016
Symphony 6
San Diego Apr 29,30 2016
Utah Nov 19-21 2015
New York Feb 11-13 2016
Symphony 7
Utah Jan 8, 9 2016
Symphony 8
Utah Feb 19, 20 2016
Philadelphia Mar 10-13 2016 (This is a big deal - see the web site for the orchestra)
Symphony 9
Utah May 27, 28 2016
Cincinnati Mar 31, Apr 2 2016
New York Apr 14-16, 19 2016
Symphony 10
Seattle Nov 19-22 2015
Philadelphia (Cooke) May 12-14 2016
Das Lied von der Erde
San Francisco Apr 6-10 2016
Tucson Jan 22, 24 2016
New York Apr 20-22 2016