2024 Keystone Montana High Country 377FL vs 2025 Keystone Avalanche 312RS

Detailed Comparison

Before committing to the 2024 Keystone Montana High Country 377FL or the 2025 Keystone Avalanche 312RS, it pays to understand exactly where each one shines and where it falls short.

Dimensionally, you're looking at 34.0 ft for the Keystone Montana High Country 377FL and 38.0 ft for the Keystone Avalanche 312RS. They're remarkably close in weight, both hovering around 8,550 lbs.

The Keystone Montana High Country 377FL sleeps 7 while the Keystone Avalanche 312RS accommodates 6. Slide-outs play a role in livability: the Keystone Montana High Country 377FL has 5 and the Keystone Avalanche 312RS has 2.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Keystone Avalanche 312RS at 74 gallons versus 63 gallons. Solar-wise, you get 400W on the Keystone Montana High Country 377FL and 100W on the Keystone Avalanche 312RS. Battery banks are 300 Ah and 250 Ah.

At $128,000 MSRP for the Keystone Montana High Country 377FL and $135,000 for the Keystone Avalanche 312RS, the Keystone Montana High Country 377FL saves you $7,000. With only a 5% price difference, the choice comes down to features rather than cost.

If you're traveling with a family, look for the model with more sleeping positions and better storage. Boondockers: look at the fresh water capacity and solar/battery systems — they determine how long you can stay out. For the full-time RV lifestyle, every gallon of tank capacity and every inch of counter space counts.

Whichever you choose, you'll be getting a capable rig. Just make sure to inspect one in person before signing.