One and three quarter Ring cycles -- and more -- remain in the season, but it's not too early to think about what's playing nearby over the summer. Below I've listed known opera choices within semi-reasonable driving distance of New York City. If I've missed some, please let me know.
[UPDATE (4/29): Another Tanglewood program added, thanks to a commenter.]
[UPDATE 2 (5/29): Castleton Festival in VA added.]
Opera Company of Philadelphia's Rape of Lucretia (June 5-14 in Philadelphia)
Stars Tamara Mumford and Nathan Gunn.
Boston Early Music Festival's Poppea (June 6-14 in Boston, and June 19-21 in Great Barrington, MA)
New York City Opera's Magic Flute, La Navarraise, and mixed aria program (June 25-27 in downtown NYC)
All in concert with orchestra. Casting unknown.
The Princeton Festival's Midsummer Night's Dream (June 20 and 28 in Princeton, NJ)
Wolf Trap's Cosi Fan Tutte (June 26-30), Ulisse (July 24-28), and "multimedia" concert Boheme (August 7) (all in Vienna, VA)
Lake George Opera's Butterfly (July 2-12) and Don Pasquale (July 3-11) (both in Saratoga Springs, NY)
The Castleton Festival's Turn of the Screw (July 3-5), Beggar's Opera (July 5-18), Rape of Lucretia (July 10-12), and Albert Herring (July 17-19) (all in Castleton, VA)
All-Britten lineup includes his arrangement of the Beggar's Opera. Lorin Maazel conducts all first nights and the July 4 Turn of the Screw; casts not announced. I assume the Lucretia production is the same as Philly's in June, which actually originated (also with Mumford) at the Castleton venue (before it became a "festival") in 2007.
Opera New Jersey's Lucia (July 10-26), Abduction (July 11-24), and Mikado (July 12-25) (all in Princeton, NJ)
Lucia stars Lisette Oropesa, while the Mikado features ACB's Yum-Yum.
Tanglewood's concert Meistersinger Act III (July 11) and staged Don Giovanni (July 26, 27, and 29) (both in Lenox, MA)
For the Wagner: James Levine, James Morris, Johan Botha, Hei-Kyung Hong, Matthew Polenzani, and Hans-Joachim Ketelsen as Beckmesser.
For the Mozart: Levine conducts a cast of relative unknowns (Morris Robinson is, it seems, the Commendatore) on the first two dates, and a Tanglewood Conducting Fellow takes his place for the last.
The Metropolitan Opera's summer recital series (July 13-August 14 in NYC parks)
Mostly young singers, though the Central Park version has Paulo Szot (and Oropesa again).
Glimmerglass Opera's Traviata (July 18-August 25), Cenerentola (July 19-August 23), The Consul (July 25-August 24), and Dido and Aeneas (August 2-23, all 11:30AM) (all in Cooperstown, NY)
Mary Dunleavy is Violetta in Jonathan Miller's new production of Traviata.
Tamara Mumford is Dido in Miller's new production of the Purcell.
Caramoor's Elisir (July 18) and Semiramide (July 31) (both in Katonah, NY)
Lawrence Brownlee is Nemorino for Elisir and Idreno for Semiramide. Angela Meade and Vivica Geneaux play Semiramide and Arsace, respectively, in the Rossini.
Bard SummerScape's Les Huguenots (July 31-August 7 in Annandale-on-Hudson, NY)
Mostly Mozart's New York premiere of A Flowering Tree (August 13-16 at the Rose Theater)
John Adams music: promising. Yet another Peter Sellars libretto/production: not promising.