Toyo Open Country AT III vs Cooper Discoverer Stronghold AT
Ahead in each discipline
The Toyo Open Country AT III and the Cooper Discoverer Stronghold AT have met in one independent test so far, and the Discoverer Stronghold AT finished ahead. The Discoverer Stronghold AT was stronger in snow and ice.
Performance profile
5 measurements from the one shared test, each tire shown as its share of the better figure.
Where each is furthest ahead
Open Country AT III
Not ahead on any measurement here
Discoverer Stronghold AT
Point at or tap any spoke for both tires' figures.
In each test the better of the two figures counts as 100% and the other as its share of it, so a 118 ft stop against 112 ft is 95%; each spoke averages the shared tests that recorded it. The scale stops at 85%: a point further in sits on the hub's edge, hollow.
Where each scores higher
Open Country AT III
Discoverer Stronghold AT
Point at or tap any spoke for both tires' figures.
Category scores are percentiles among tires of the same season and class: 90 means this tire out-performs 90% of them, measured across every test we hold, not only the ones it appeared in.
Every measurement, side by side
Both tires' figures from the one test that ran them together, on the same car, in the same size, on the same day. The bar grows towards the tire that did better.
| Measurement | Open Country AT III | Gap | Discoverer Stronghold AT |
|---|---|---|---|
| Snow Discoverer Stronghold AT ahead | |||
| Snow Braking ft | 79 | 8.2% | 72 |
| Snow Traction ft | 48 | 0.6% | 47 |
| Subj. Snow Handling pts | 3.67 | 54.5% | 5.67 |
| Ice Discoverer Stronghold AT ahead | |||
| Ice Braking ft | 53 | 0.5% | 52 |
| Ice Traction s | 6.42 | 10.4% | 5.75 |
Braking distances and lap times are better when lower; speeds, wear and grip figures when higher. A test's figures are its own: sizes, cars, surfaces and temperatures differ from one to the next, which is why the averages here are only ever of tests the two tires shared.
Head to head in 1 test in 2026
Each row is one published test in which both tires ran on the same car, in the same size, on the same day. The line is the whole field, winner on the left.
| Test | Open Country AT III | Field | Discoverer Stronghold AT |
|---|---|---|---|
| 2026 Tire Rack All Terrain Tire Snow Test | P27 of 30 | P1 of 30 |
Open Country AT III vs Discoverer Stronghold AT: your questions
Is the Toyo Open Country AT III or the Cooper Discoverer Stronghold AT the better tire?
The Toyo Open Country AT III and the Cooper Discoverer Stronghold AT have met in one independent test so far, and the Discoverer Stronghold AT finished ahead. On the Tire Reviews Score, which weighs every test and review we hold, the Open Country AT III scores 6.1 and the Discoverer Stronghold AT 8.2 out of 10.
Which is better in snow?
The Discoverer Stronghold AT led 3 of the 3 snow measurements the shared tests recorded.
Which is quieter and more comfortable?
Owners rate comfort 8.8/10 for the Open Country AT III and 8/10 for the Discoverer Stronghold AT.
What do owners say?
Owners rate the Open Country AT III 81% from 10 reviews and the Discoverer Stronghold AT 92% from 2.
More comparisons with these tires
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Mickey-Thompson Baja Boss AT vs Toyo Open Country AT III
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Goodyear Wrangler All Terrain Adventure vs Toyo Open Country AT III
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Continental TerrainContact AT vs Toyo Open Country AT III
3-1 in 4 shared tests
Run either of these?
Your review is the part of this page no test can supply: how the tire wore, how it aged, what it was like in the rain in year three. It takes about five minutes.
Review the Open Country AT III Review the Discoverer Stronghold AT
Where this data comes from
Finishing positions and measurements are transcribed from each published test. A test only counts here when both tires ran in it, so every figure was recorded on the same car, size and day as the one it is compared to.
About the TR Score
The Tire Reviews Score rates each tire out of 10 from every independent test result and vetted owner review we hold, so two tires can be compared even before a test has run them together.
Who does the testing
Every test published as a Tire Reviews test is run by Jonathan Benson, who has been testing tires independently since 2007.