Minimum tread depth for all 4 tires is 2/32"
in Illinois it is 4/32 front tires and 2/32 all tires
All tires on vehicles driven in Missouri must be safe. There is no listed minimum tiretread depth or mention of tire grooving in the laws.
In the United States, the tread has to be 4/32 (3.17mm) or more on the front tires and 2/32 (1.58mm) or more on the back tires. rear tires can be retreaded but not the front "steer" tires.
2/32 of an inch in most parts of the USA. Local laws may vary.
4/32 on steer axle.2/32 on all others
In most parts of the USA it is 2/32 of an inch.
In Oregon there is no minimum thread depth, but just that Oregon requires that tires be in safe operating condition, without any bulges or exposed cords.
On or before your country's legal minimum requirement for tread. If in doubt see out a qualified fitter to check the tread depth for you
In Virginia you must have 2/32 tread depth on all 4 tires to pass inspection.
Turn a United States penny upside in the tread. If you can see all of President Lincoln's head, your tire is bald.
It varies from state to state. In most states it is 2/32" but in some it is 3/32".