NYC-region ultimate frisbee: all youth leagues halted as of yesterday through at least 3/19, and if I were to bet I'd say weeks longer. Adult organized pickup and rec leagues suspended. The league seasons are not yet cancelled. Numerous schools particularly in westchester and NJ closed as of now, likely for at least a few weeks. There's a regional volunteer-led organizing nonprofit, whose Board has been making these decisions (one member of it is a professional epidemiologist, so there are no cavalier voices in the room).
NYC Parks & Rec hasn't yet sent anything about field and court closures, it would likely be ordered at the city level rather than be Parks-imposed. I've gotten a lot of notifications from them and related state-backed entities (Brooklyn Bridge Park, Hudson River Parks, state parks, etc) saying they're monitoring the situation and here's-what-will-happen-if-we-close, etc.
Pittsburgh: HS leagues postponed through 3/23, re-evaluated then. Schools teetering on decisions of closing. The school I coach just (5 minutes ago) made the decision to close tomorrow, so as a result we're not going to hold practice while their school is not in session (kinda defeats the purpose of the school district's closure, which we should respect). No idea wtf parents are supposed to do to keep working. Decisions probably ratified by the Board here, but in practice the executive director is super on top of all her shit so I'm assuming it was basically her call.
Nationally: USA Ultimate has cancelled all sanctioned events through 4/20 (so, the next 5 weeks including what would've been the first round of the college national championship tournament). This includes what is traditionally the heart of the college season, which makes sense in light of the number of colleges that are finishing their semesters remotely online and just not re-convening from spring break. The college division is the largest division of play nationally, so I'm sure that was a decision that hurt to make, but really with the schools effectively closed and students not around each other, it was the only decision to make.