What are the typical snow levels and conditions experienced in Commonwealth Basin during the winter months?

Snow levels and conditions vary significantly. In January, there was about 3 feet of snowpack, sufficient for travel but with tricky creek crossings and an icy summit block. By March, the snow was firmly packed and microspikes were sufficient. In April, snowbridges were narrow and a crossing point for Commonwealth Creek had to be found.

What are the parking situations at the trailhead?

Parking availability has varied. As of March 2, 2026, there was plenty of parking at the Summit on a Monday morning, and parking was free on weekdays and non-holidays. However, on a weekend in January, parking was limited and paid, with passes only available after 7 am. In April, the PCT N parking lot was snow-covered.

Are there any significant trail obstacles or hazards reported?

Obstacles have included narrow snowbridges over Commonwealth Creek, with one marked bridge noted as out as of April 10, 2026. Creek crossings were described as tricky in January due to lower snowpack. As of February, microspikes were generally recommended, with snowshoes potentially becoming beneficial past 2.75 miles, [February 13](https://www.wta.org/go-hiking/trip-reports/trip_report-2026-02-14.133321550304).

Commonwealth Basin Snowshoe

Snoqualmie Region

updated 5 months ago

The Commonwealth Basin trail offers scenic beauty with large old-growth trees, as noted in multiple reports. Conditions varied throughout the winter season. In early January, there was about 3 feet of snowpack, but it was not enough to cover saplings, leading to tricky creek crossings and an icy summit block on Guye Peak, requiring crampons and an ice axe for ascent. By mid-February, snowshoes were generally not needed, and microspikes were recommended, though they could become beneficial past 2.75 miles if conditions worsened, February 13. By early April, snow was still present, blocking the PCT N parking lot, and requiring navigation up the Old Commonwealth trail with narrow snowbridges over Commonwealth Creek. The bridge marked on Gaia was out, necessitating a creek crossing around 3580'. In March, conditions were described as gorgeous with firmly packed snow, requiring only microspikes. The Old Commonwealth trail was well-traveled by skiers and snowshoers, offering a wider path compared to the PCT. Parking was available on weekdays at the Summit, with free parking on weekdays and non-holidays as of March 2. In mid-February, parking near the highway was necessary due to an icy and snowy road leading to the entrance, but this did not significantly extend the trek.

Generated from 10 trip reports. Trails change faster than reports do, so check anything you’d turn around for.

What hikers ask about Commonwealth Basin Snowshoe

Generated from the most recent trip reports, newest 5 months ago. Check anything you’d turn around for.

No trip reports on this trail in 5 months, so everything below is at least that old.

There are no reports detailing road conditions for September 23, 2026. The most recent report from April 10, 2026, indicated that the PCT N parking lot was still blocked and snow-covered. Prior to that, in February, a portion of the road leading to the entrance was closed due to ice and snow, requiring parking near the highway, February 15.