There are multiple sites that try to infer whether jamming is happening.
https://spoofing.skai-data-services.com/
https://www.flightradar24.com/data/gps-jamming
Ukraine is of course a huge hotbed of jamming, but every time I've looked, there's been jamming on the US/Mexico border and a bit north of Texas around an airbase.
There's also a lot of info available here: https://www.nstb.tc.faa.gov/