Mountain Hardwear - Trango 3

My opinion here. In general I think you can go lighter on tents in the PNW than other places. If the weather is bad enough you aren't climbing, you are probably hiking out as the car as it is usually no more than 3-4 hours away (Glacier peak may be the exception). With exception of Rainier and Adams, you really don't camp higher than like 6000 ft so a 3 Season tent can be fine for most of the time. There's places to just go backpacking that you are camping at similar elevations. That said, I've been on Rainier before where it got pretty windy, even in summer, so there are times that I felt a 4 season tent is needed. Forecast are probably good enough to make that determination ahead of time. There are lighter and heavier options within 4 season tents. Expedition style tents like a MH Trango are pretty bomber, but are heavy. A single wall tent is pretty terrible if there is any chance of rain, but if its dry and you just want some sun and wind protection, they can be a reasonable option that is half the weight. There's other 4 season double wall tents that aren't as bomber, but are a few pounds lighter (MSR).

Personally snapped a three season tent on rainier from the wind a few seasons ago. Granted it was a big Agnes tiger wall. Upgraded to a mountain hardware tango and it’s great.