Boise Riverside RV Park
Campground
Campground · 3.5 mi from the trail
Idaho · Mountain biking · Near Idaho City
Who Now Loop #51
- 0.4 mi
- round trip
- 141 ft
- climb
- Singletrack
- surface
- Out and back
- route
- Apr–Jun, Sep–Oct
- best months
Who Now Loop #51 is a short, hard mountain biking route in Idaho's Hillside to Hollow Reserve, a city-managed reserve. The trail is an out-and-back of about 0.8 miles, with a total climb of about 140 feet from a low point of 2,936 feet to a high of 3,010 feet. The steepest stretch comes at about 0.3 miles in, with a 7% grade. The most comfortable months for a ride are typically late spring and early fall. Typical averages from the nearby Boise Air Terminal weather station show May highs around 72°F and September highs around 80°F, while July and August average in the low 90s. The trail sits close to several other routes. #57A Harrison Hollow Loop is about 0.1 mile away, and #58 Harrison Ridge and #57 Harrison Hollow (AWT) are each about 0.3 mile off. For climbing, Rocky Canyon is roughly 4 miles away.
Around this trail
Add any of these when you start a tripSleep close Eat after 
If it rainsCamEQ, Facade of Art Museum designed by Trout Architects and Mark Mack in 1988, Public domain · Wikimedia Commons
Places © OpenStreetMap contributors · Photos: CamEQ, Facade of Art Museum designed by Trout Architects and Mark Mack in 1988, Public domain (commons)
More in Idaho CityLocal outfitters
- Riverpond Campground34 mi away
Not on Roamze yet. Their page has how to reach them.
Best time to go · Apr–Jun, Sep–Oct
Best time to visit Who Now Loop #51
Best months: April–June and September–October. Best months have typical highs of 55–85 °F, lows of 30 °F or warmer (32 °F where the station doesn't record snow), at most one snowy day and no more than 12 wet days.
Jan
39° / 26°
11 wet · 5 snow
Feb
46° / 29°
9 wet · 3 snow
Mar
55° / 35°
10 wet · 2 snow
Apr
62° / 40°
9 wet
May
72° / 48°
8 wet
Jun
81° / 54°
5 wet
Jul
93° / 62°
3 wet
Aug
91° / 61°
2 wet
Sep
80° / 53°
4 wet
Oct
65° / 42°
6 wet
Nov
49° / 32°
10 wet · 2 snow
Dec
39° / 25°
12 wet · 5 snow
Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Boise Air Terminal, ID, 5.9 mi away at 2,814 ft. Source: NOAA NCEI U.S. Climate Normals 1991–2020.
Keep exploring — more rides worth the drive
RIDE
Who Now Loop #51
Next door
0.12-mile out-and-back singletrack in Idaho, 20 ft elevation gain, rated difficult / black diamond
RIDE
#57A Harrison Hollow Loop
Next door
0.27-mile easy gravel road out-and-back in Idaho with 31 ft gain.
RIDE
#57 Harrison Hollow (AWT)
Next door
0.78-mile out-and-back singletrack with 208 ft gain in Idaho.
RIDE
#54 Robert Smylie
~1 min drive
0.82-mile trail in Full Sail, Idaho, gaining 236 ft of elevation.
RIDE
Who Now Loop #51
Next door
0.58-mile hard singletrack out-and-back in Idaho with 273 ft gain.
RIDE
#57A Harrison Hollow Loop
Next door
0.11-mile easy gravel road out-and-back in Idaho with 10 ft gain.
RIDE
#57 Harrison Hollow (AWT)
Next door
0.10-mile moderate singletrack out-and-back in Idaho with 54 ft elevation gain.
RIDE
#53 Buena Vista
~1 min drive
#53 Buena Vista is a 1.69-mile sand trail in Full Sail, Idaho with 973 ft of elevation gain.
RIDE
#57A Harrison Hollow Loop
Next door
#57A Harrison Hollow Loop is a 0.25-mile easy gravel road out-and-back in Idaho with 69 ft of elevation gain.
RIDE
#29 Lower Hulls Gulch
~2 min drive
0.1 mi · Moderate
Map and trail data © OpenStreetMap contributors
