Quick overview,
free camping in the dirt at Bend in The Road. Closest to the track, and 1 mile from truckstop that has restaurant and showers.
Rooms this time of year are cheap 45 to 85 bucks I think (not sure) , but often cheaper on weekdays.
During Speed week , early or mid Aug, 200 and up..
Temps probably be around 95 During The day, bring loose fitting light coloured pants, Salt is reflective, and bounces the rays back. A big hat helps and lots if water is a must.
Riding your bike onto salt flats is very very hard on it.
You can minimise this by parking at the boat launch... the end of the pavement where the Bonneville sign is, the thumbing a ride to the track..