That depends on if it's a 4 (no change scheduled) or a 6 (at 90,000 miles). This information is provided on: http://smg.toyotapartsandservice.com/
This site also covers other toyotas
I have a 2006 Toyota highlander hybrid, do I need to change timing belt or chain?
75,000
Factory recommendation is 90,000 miles.
The manufacturer recommends that the timing belt be changed at 90,000 miles. == ==
90,000 miles or 150,000 kilometers.
At the same time u are doing your timing belt 90000
The 3.3 liter V6 in a 2007 Toyota Highlander has a timing BELT
Belt - change at 90,000 miles.
For the 6 cylinder engine - factory recommendation is 90,000 miles.
The factory recommendation is 95,000 miles.
Factory specs recommend at 90,000 miles.
According to the Gates website ( they make timing belts etc. ) The 3.0 liter V6 engine in a 2001 Toyota Highlander has a timing BELT , the recommended change is done every 90,000 miles and it is not an interference engine