Open Country A/T III tires are all-terrain tires made by Toyo for trucks and SUVs that need to handle both highway driving and unpaved roads

The Open Country A/T III is Toyo's third-generation all-terrain tire, designed for light trucks, pickup trucks, and SUVs. These tires sit between highway-focused tires and extreme off-road tires — they grip on asphalt and concrete, but also bite into dirt, gravel, and light mud. They come in sizes ranging from 31 inches to 35 inches in diameter, fitting common truck and SUV models from the last 15 years.

The tire carries a treadwear warranty that varies by size and load rating, typically between 40,000 and 50,000 miles. Toyo rates them for three-peak mountain snowflake certification, meaning they meet severe winter performance standards. The sidewalls are reinforced to resist punctures from rocks and rough terrain, a feature that matters if you drive on unimproved roads regularly.

Key Takeaways

  • Open Country A/T III tires are designed for vehicles that split time between paved roads and unpaved terrain, with reinforced sidewalls and aggressive tread patterns.
  • They come in sizes from 31 to 35 inches and fit most full-size pickup trucks and SUVs manufactured in the last 15 years.
  • The treadwear warranty ranges from 40,000 to 50,000 miles depending on tire size and load rating, and they carry three-peak mountain snowflake winter certification.
  • Highway fuel economy is typically 1 to 2 miles per gallon lower than highway-only tires on the same vehicle, due to the aggressive tread design.

Tread design and off-road performance

The A/T III has a blocky, open tread pattern with deep grooves running across the tire face. This design channels water and mud away from the contact patch, which is why the tire performs better in wet conditions and light mud than a highway tire would. The blocks are angled to bite into soft surfaces without tearing the tire.

On gravel and dirt roads, the aggressive tread edges grip better than a standard tire, reducing sliding and improving steering response. The reinforced sidewalls resist cuts from sharp rocks and roots, which is the main failure point for highway tires on rough terrain. However, the A/T III is not a rock-crawling tire — it is built for ranch roads, forest service roads, and rough ranch property, not for extreme rock gardens or deep mud.

Highway handling and fuel economy

On paved roads, the A/T III handles like a truck tire, not a car tire. The ride is firmer than a highway-only tire because the sidewalls are stiffer to protect against punctures. Cornering grip is good but not as sharp as a performance highway tire. Braking distance on dry pavement is comparable to other all-terrain tires in the same class, though slightly longer than highway-only tires.

Fuel economy typically drops 1 to 2 miles per gallon compared to a highway tire on the same vehicle. The aggressive tread pattern creates more rolling resistance, and the heavier construction adds weight. On a truck that gets 18 miles per gallon with highway tires, expect 16 to 17 miles per gallon with the A/T III. This difference compounds over a year if you drive mostly on highways.

Wet weather and winter performance

The A/T III carries the three-peak mountain snowflake rating, which means it meets the Rubber Manufacturers Association standard for severe winter conditions. The sipes — small cuts in the tread blocks — create edges that grip ice and packed snow. The deep grooves shed slush and water, reducing hydroplaning risk.

In heavy rain on highways, the tire performs well because the open tread pattern drains water quickly. On wet dirt roads, the tread edges bite into the surface better than a highway tire would. However, the A/T III is not a dedicated winter tire — it is a three-season tire that meets winter standards, not a tire designed primarily for snow and ice. If you live in a region with sustained snow and ice, a dedicated winter tire will outperform it.

Tire size and vehicle compatibility

The Open Country A/T III comes in 18 sizes, from LT245/75R16 (31 inches) to LT285/75R16 (35 inches), plus several sizes in 17-inch and 20-inch wheels. The "LT" prefix means light truck, which is the load rating class. You must match the tire size to your vehicle's door jamb label — the placard on the driver's side door frame that lists the manufacturer's recommended tire size and pressure.

Fitting a larger tire than recommended (called "plus sizing") is possible but changes your speedometer reading and can affect suspension geometry. A 33-inch tire on a truck rated for 31-inch tires will read 3 to 4 percent slower on your speedometer. If you are considering a size larger than the door jamb recommendation, check your vehicle's manual or contact the manufacturer to confirm suspension clearance.

Cost and warranty coverage

Retail prices for the A/T III range from $150 to $280 per tire depending on size, with larger sizes costing more. A full set of four tires typically costs $600 to $1,100 before installation and balancing. Installation, balancing, and valve stems usually add $80 to $150 per tire at a tire shop.

The treadwear warranty covers defects in materials and workmanship for the first two years or 2,000 miles, whichever comes first. After that, the tire is covered for treadwear (gradual wear from normal use) for 40,000 to 50,000 miles depending on size. The warranty does not cover punctures, sidewall damage, or wear from underinflation or misalignment. Toyo also offers a road hazard warranty as an add-on purchase at the time of sale, which covers puncture repairs and replacement for an additional cost.

Maintenance and tire care

All-terrain tires require the same maintenance as any other tire: monthly pressure checks, rotation every 5,000 to 7,000 miles, and alignment checks if you notice uneven wear. The A/T III's aggressive tread can pick up rocks and debris, so inspect the tread monthly for embedded objects. A small rock wedged in a groove will not cause when ready failure, but it can work deeper into the tire over time.

Pressure matters more with all-terrain tires than with highway tires because the softer sidewalls flex more. Underinflation by 5 pounds per square inch will noticeably increase rolling resistance and fuel consumption, and will accelerate sidewall wear. Check pressure when the tires are cold — before driving or at least three hours after driving — because pressure rises as the tire heats up.

Frequently Asked Questions

Can I use Open Country A/T III tires in snow and ice?

Yes, they carry three-peak mountain snowflake certification and perform well in snow and light ice. However, they are not a dedicated winter tire. If you live where snow and ice persist for months, a winter tire will provide better grip and shorter stopping distances. The A/T III is a good choice for regions with occasional snow or for drivers who want one tire for all seasons.

Will A/T III tires hurt my fuel economy?

Yes, expect 1 to 2 miles per gallon lower than a highway tire on the same vehicle. The aggressive tread pattern and heavier construction create more rolling resistance. If you drive mostly on highways, a highway tire will save you money on fuel. If you split time between highways and rough roads, the trade-off is usually worth it.

What is the difference between A/T III and other Toyo all-terrain tires?

The A/T III is the newest generation. The A/T II (previous generation) has a slightly less aggressive tread and shorter treadwear warranty. The Open Country R/T is a more aggressive tire for heavier off-road use. The A/T III sits in the middle — better for highway driving than the R/T, but more capable off-road than older A/T models.

Do I need to rotate A/T III tires more often than highway tires?

No, the rotation interval is the same: every 5,000 to 7,000 miles. However, if you drive mostly on rough terrain, inspect them more frequently for damage. Rocks and sharp objects can puncture the tread or sidewall, and catching damage early prevents a blowout.

Can I use Open Country A/T III tires on a vehicle not rated for them?

Only if the tire size and load rating match your vehicle's door jamb label. The load rating (the number after the tire size) must be equal to or greater than the vehicle's requirement. Using a tire with a lower load rating than required can cause overheating and failure. Always check the door jamb label before purchasing.