Found this list of exemptions at https://www.captions.org/factsheet.cfm
There are some exemptions to the above captioning rules (for both English and Spanish language programming). For example, captioning is not required for:
Programs which are shown between 2 a.m. and 6 a.m. local time;
Locally produced and distributed non-news programming with no repeat value (e.g., parades and school sports);
Commercials that are no more than five minutes long;
Instructional programming that is locally produced by public television stations for use in grades K-12 and post secondary schools (only covers programming narrowly distributed to individual educational institutions);
Programs in languages other than English or Spanish;
Programs shown on new networks for the first four years of the network’s operations;
Public service announcements under 10 minutes, unless they are federally-funded or produced; and
Video programming providers with annual gross revenues under $3 million (although such programmers must pass through video programming that has already been captioned).
In addition, a video programming provider or distributor may ask the FCC for an exemption for specific programming if supplying captions for that programming would result in an undue burden for the provider or distributor.