Hardrock and Osborn Hills Loop Trail

MODERATE 20 reviews

Hardrock and Osborn Hills Loop Trail is a 3.8 mile moderately trafficked loop trail located near Grass Valley, CA that features beautiful wild flowers and is rated as moderate. The trail offers a number of activity options and is accessible year-round. Dogs are also able to use this trail but must be kept on leash.

3.8 miles 464 feet Loop

dogs on leash

kid friendly

birding

hiking

nature trips

trail running

walking

forest

views

wild flowers

wildlife

Walk around Empire Mine State Historic Park and explore several smaller abandoned mines and 100 years of mining history Welcome to Empire Mine State Historic Park, home to Empire Mine, which was once the most profitable gold mine in California during the gold rush. This hike will take you around the Empire Mine site and past several smaller mines which were all eventually absorbed as part of the large mining operation at Empire Mine. Along this hike you will see old foundations and rusted machinery covering 100 years of hardrock mining history.

19 days ago

walking
3 months ago

Easy. Nice short loops.

walking
4 months ago

walking
6 months ago

Very nice moderate walk

hiking
6 months ago

hiking
6 months ago

Beautiful loop. You can see the mine grounds, but can't enter without a fee - although the museum/visitors center is free. Some steep climbs.

6 months ago

Great ride with some good uphill climbs & some great technical riding from beginner to advanced riders

hiking
8 months ago

hiking
8 months ago

I took my over 50's ladies group up to hike a couple of the trails. We all made it okay but you I have to take into consideration you most definitely are hiking up and down a mountain. The paths are well used/maintained but there is a steep grade. The trails are used by lots of people so they are busy so not a whole lot of peace and quiet. It's nice that there are state maintained restrooms at the mine. Poison oak is on the sides of the trails so watch the kiddos and pets. We will do this trail again.

hiking
1 year ago

The Mansion and the grounds are very cool. Multiple loops for hiking as well.

1 year ago

1 year ago

hiking
1 year ago

I go there all of the time. There are a number of different length trails. The woods are quiet yet close to civilization. The mining museum and mansion are well worth seeing.

walking
1 year ago

This is an awesome trail, they have done a lot of improvements, it's quiet and woodsy, feels like you're in the forest yet you're in the middle of town. The convenience to get to makes it a regular place for me to jog, bike, hike and stroll with my city visitors! I have logged as much as 6 miles or you can do as little as 1,your choice. Include union Hill and you can do even more. The hill climbing helps give great workout in short amount of time, or avoid the hills and just enjoy the flatter trails. Dogs love it, horses are enjoyable to pass along the way. If you go in summer, start early.

hiking
2 years ago

IT WAS AN EASY VERY SHADY AND COOL. GOOD TRAIL FOR A HOT DAY. WIDE TRAIL PATHS. GREAT FOR KIDS. LOTS OF MINING SCENARY.

walking
2 years ago

Started at Union Hill and went to Penn Gate, ends up being right about 3 miles. Easy trail. Quite. Can do with a kid strapped to your back;)

hiking
2 years ago

Nice short trails to take the dog when I don't have a lot of time. Some beautiful buildings and landscaping on the grounds. I had previously only hiked the trails but never visited the paid area, definitely worth the trip and so cool that its so dog friendly. You don't see that often in a state park

hiking
3 years ago

There are several different trails on the Empire Mine property. You can hike as little or as much as you like. Great for the kids. There are several access points to the trails. A few trails extend north of Hwy 174. There are some beautiful areas through there as well.

hiking
4 years ago

I have hiked this trail with my family at least 5 or 6 times. Our son is only 4 and has a wonderful time on this trail. It is wide and an easy hike. There is also the mansion and grounds that you can tour for a small fee in the same park. There is old mining equipment that children love to look at and climb on.

hiking
4 years ago

My wife and I have hiked the Hardrock Trail at the Empire Mine State Park several times. The trail is a 2-mile loop and is easy with little gain/loss in elevation. This trail is the only one in the park for hikers only; no mountain bikes or equistrians are allowed. Dogs are allowed but must be leashed. Along the trail you'll see abandoned mining equipment from the area's silver prospecting days and cross a small creek. Be careful when leaving the trail due to poison oak in the area. There's restrooms at Empire Mine Visitor's Center. Conveniently located off Hwy. 49 near Grass Valley and Nevada City.