Guam on a US State Licence 2026: 90 Days and a 45 mph Cap

Guam is a US territory, so a stateside licence carries over, but Guam’s code puts a clock on it. Count the days from your arrival: a licence from the mainland, Hawaii, Alaska or another territory is good for 90 of them.

Your licence, and the 90-day clock

Section 3101(d) of Guam’s vehicle code lets anyone holding a valid licence from any US state, territory or commonwealth drive for 90 days from the date of arrival. No International Driving Permit is involved. For a holiday that settles it; for a long posting it does not. After 90 days you need a Guam licence, and a stateside licence holder is spared the written and road tests but surrenders the old card. The alternative is to register your licence with the Department of Revenue and Taxation for a fee of up to USD 25, which stretches the period to one year from arrival or the licence’s expiry, whichever comes first. Active-duty service members, and their dependents, who hold a stateside licence are exempt from getting a Guam licence at all.

The 45 mph ceiling

Interstate habits do not fit here. Guam’s code makes any speed above 45 mph unlawful, on every road, and on top of that requires a speed that is reasonable for the surface, width and traffic. One rule surprises visitors: you must slow to 10 mph when passing a bus that is taking on or letting off passengers on the roadway. Traffic keeps to the right, as at home.

Alcohol and phones

Guam’s impaired-driving law sets the familiar 0.08% blood-alcohol line, and 0.04% for drivers under 21. Using or even holding a mobile phone while driving is unlawful, including while stopped in traffic or at a light, so mount it and set the route before you move.

The Driving Permit Checker covers other Pacific stops on the same trip.

Sources

• Guam Code Annotated, Title 16 (Vehicles), Chapter 3: § 3101(b) military exemption, § 3101(d) 90 days on a US licence and the registration option, § 3301 speed limits (45 mph maximum; 10 mph passing a bus), § 3346 mobile phone restriction: col.guamcourts.gov
• Guam Code Annotated, Title 9, Chapter 92 (Safe Streets Act of 2018), § 92102 (0.08 percent; 0.04 percent under 21): col.guamcourts.gov