Arizona Frost Laws & Spring Thaw Limits

How Arizona handles spring thaw

Arizona has no frost laws. The ground does not freeze deep enough to thaw-weaken, so ADOT posts no spring load limits — normal axle and gross weights hold all year, Interstate and state highway alike, even in the northern high country around Flagstaff. A seasonal condition can only show up inside a specific oversize or overweight permit tied to your load. There is nothing seasonal to check before you run.

Window, reduction, and where to check

• Season: No seasonal restrictions. Arizona's climate does not freeze the roadbed deep enough to thaw-weaken, so ADOT posts no spring load limits in any month or zone.
• Reduction: None.
• Interstates: Exempt from the seasonal reduction
• Find the current order: Nothing seasonal to check. For a specific heavy or oversize move, any weather or route condition comes through the ADOT Commercial Permits office, not a frost order. Statewide restriction info is at azdot.gov.
• Overweight penalty: Not applicable; no seasonal limit exists. Standard Arizona overweight fines apply to the normal size-and-weight limits (single axle 20,000 lb, tandem 34,000 lb).

More for Arizona