Hardrock and Osborn Hills Loop Trail

moderateYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray Star(231)
Empire Mine State Historic Park

Hardrock and Osborn Hills Loop Trail is a 3.8 mile heavily trafficked loop trail located near Grass Valley, California 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.

Distance: 3.8 miles Elevation Gain: 436 feet Route Type: Loop

dogs on leash

kid friendly

hiking

horseback riding

nature trips

walking

bird watching

running

forest

views

wild flowers

wildlife

Note: This park is only open to locals and passive walk ins. There is NO vehicular access and parking lots are closed. 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.

hiking
4 hours ago

Nicely shaded. Great little trail. Lots of poop.

mountain biking
rocky
16 days ago

hiking
2 months ago

Awesome trail; lots of shade. I’ve been running this route and others the last several years. Nicely kept trails, some good hills but nothing technical.

Very nice, peaceful trail. Lots of shade. Didn’t notice any mosquitos when we went; not many people either. Just the right amount of hills for a nice workout. Easy to moderate depending on your pace. Next time we go back it will be with our bikes. Parking lot closes at 5:00 PM and there is a fee.

Very cool trail! Taking the road at first really sucks but once u get off it it’s really nice, we stayed on trails next to the main trail and it was sooo worth it! It was so fun! We went off trail in many different areas and it was so worth it! Found some amazing areas

hiking
3 months ago

Beautiful day, beautiful place can’t wait to go back.

hiking
muddy
snow
4 months ago

hiking
muddy
4 months ago

hiking
icy
muddy
6 months ago

hiking
snow
6 months ago

hiking
7 months ago

love this trail to do a quick trail run. few rocks but still a great wide trail. shaded alot. i use it 3 to 4 times a year.

hiking
8 months ago

pleasant for a family hike with kids.

running
9 months ago

Decent running, some inclines for a bit of a challenge. Well shaded.

hiking
9 months ago

Great network of trails! Beautiful wildflowers everywhere.

horseback riding
10 months ago

Drove up there because we had heard the trails were great for horseback riding but when we arrived at 4:15 on Saturday, July 5, the gate leading to the staging area was locked. When we drove up to the visitor center and asked if there was a second staging area she replied yes but the gate closes there at 5 PM. It was a hot day and I can’t imagine people wanting to ride before 5 PM. All other parks we go to don’t close gates until between 8 and 9 PM in the summer. The park rep also said you had to be a member of the local horse club in order to have the passcode for the gate in order to access the trails. Seems odd.

hiking
10 months ago

I always love this trail. One of my very favorites. Today was really crowded as it was a holiday so I took all the side trails and avoided the main one.

hiking
11 months ago

If you are looking for spectacular views or waterfalls, this is not the trail for you. It is a gravel path which turns into dirt about halfway through. Lots of trees, but there are parts that not shaded. Lots of horse droppings along the way. Hard to find- park in parking lot for Empire Mine SP and go towards the end of the parking lot. You’ll see a big gate for authorized cars but there is a walking entrance for people right next to it. Make that first right onto the trail and you’ll pass Orleans Stamp Mill. Continue on that path until you come up to Hard Rock trail on the right. We did get “lost” a few times and had to check the map on All trails. Very lightly trafficked which was so nice! It was 75 today and the perfect weather to explore.

hiking
Mon May 20 2019

One of my favorites!

Trail Run

Nice trail. Lots of other off shoots to take. Be careful to stay on the right path

walking
Wed Apr 10 2019

Easy walking in nature with dog. Close to Nevada City and easy to access. Next time I want to take the various options available along the way. Well maintained, easy free parking. Took the garden tour and loved every minute of it - awesome gardens and knowledgeable docents. Next time we want to take the mining museum tour.

Training...Trail run!

Was a fun little training trail run today. First time on this trail...stoked it’s close to home. I’ll be back.

hiking
muddy
Thu Apr 04 2019

Muddy, wear tall socks or pants. The trail is mostly level. The state park was doing some controlled fire burning about a half mile into the trail. Bring your dog on a leash. No need for snacks, good for a long walk or even a trail run. Happy trails!

Sun Mar 31 2019

Hiked it yesterday. Ground soft in so places but well worth some mud on your shoes.

Sun Mar 31 2019

nice with a soggy bottom

hiking
Mon Mar 25 2019

Made several trips here already. Worth it on foot, and I can’t wait to do it again on a mountain bike. So much to see.

Showing results 1 - 28 of 231