Bonanza Peak (Washington)When to Go
Best Time to Visit Bonanza Peak (Washington)
Best attempted in high summer when snow and glacier travel are more predictable; climb only with proper mountaineering experience or a certified guide.
Summer (Jul-Sep)
July-September · 0-15°C (at higher elevations)
Most stable weather and snow-free routes, but late-season glacial travel may still be required.
Late Spring (May-Jun)
May-June · -5-10°C
Snowpack can make routes avalanche-prone; approach windows are variable.
Weather & Climate near Bonanza Peak (Washington)
Climate
Bonanza Peak (Washington)'s climate is classified as Tundra - Tundra climate with cold summers (peaking in August) and freezing winters (coldest in December). Temperatures range from -13°C to 15°C. Abundant rainfall (1622 mm/year), wettest in December.
Air Quality:
AQI 32
Good
Temperature & Rainfall
Temperature Range
15°
Warmest Month
-13°
Coldest Month
Monthly Conditions
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | - | -13° - -4° | -15° | 225 mm | - | - | 3.7 m/s | - | - |
| February | - | -11° - -2° | -12° | 168 mm | - | - | 3.5 m/s | - | - |
| March | - | -10° - -3° | -12° | 147 mm | - | - | 3.6 m/s | - | - |
| April | - | -8° - 0° | -9° | 98 mm | - | - | 3.7 m/s | - | - |
| May | - | -4° - 4° | -4° | 100 mm | - | - | 3.7 m/s | - | - |
| June | - | -1° - 9° | 1° | 95 mm | - | - | 3.7 m/s | - | - |
| July | - | 2° - 14° | 5° | 57 mm | - | - | 3.6 m/s | - | - |
| August | - | 3° - 15° | 7° | 66 mm | - | - | 3.4 m/s | - | - |
| September | - | 0° - 11° | 3° | 81 mm | - | - | 3.5 m/s | - | - |
| October | - | -5° - 6° | -4° | 132 mm | - | - | 3.7 m/s | - | - |
| November | - | -10° - -2° | -11° | 222 mm | - | - | 3.7 m/s | - | - |
| December | - | -13° - -5° | -15° | 231 mm | - | - | 3.5 m/s | - | - |
Getting There & Around
How to Get to Bonanza Peak (Washington)
Access is typically via backcountry routes in the North Cascades. The approach depends on the chosen route; many parties start from trailheads in the Okanogan-Wenatchee National Forest or through glacier-access roads. Nearest towns with services include Winthrop and Twisp; detailed route planning and permits for overnight stays may be required.
Tips for Visiting Bonanza Peak (Washington)
- This is a remote, technical peak - hire a local guide with glacier experience if planning a climb.
- Approach routes cross glaciers and steep terrain; check current avalanche and glacier conditions with local ranger stations.
- Plan for a multi-day expedition with established basecamp and carry emergency communications (satellite or PLB).