Rating:
Area: San Francisco Peninsula
Distance: 1 mile
Type: Loop
Difficulty: Medium
Elevation gain: 400ft (from 200 - 600ft)

Almost everybody flying through San Francisco International Airport will recognize the landmark that is Sign Hill, a century old testament to South San Francisco's past. Though the hill no longer overlooks the steel mills which defined the city, they've now been replaced with the more modern industry of biotechnology.

Short yet memorable in its own way, a counter-clockwise loop of the Letters Trail and the Iris Hill Trail first provides great exposed views of the urban environment below and then returns down a pleasant set of woodland steps.

Tangents:
- Trailspotting Images: Sign Hill on Flickr
- Yelp Reviews: Sign Hill
- Wikipedia: South San Francisco & Sign Hill

California Hiking by Tom Stienstra and Ann Marie Brown