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Mountains to Sea Trail from Newport Beach is a 12.1 mile moderately trafficked point-to-point trail located near Newport Beach, California that offers the chance to see wildlife and is rated as moderate. The trail offers a number of activity options and is accessible year-round.

Length 12.1 mi Elevation gain 288 ft Route type Point to Point
Hiking Nature trips Road biking Walking Bird watching Running Beach Wildlife No dogs
Waypoints (0)
Weather
UV Index
Daylight
Reviews (50)
Photos (250)
Recordings (43)
Completed (161)
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Alan Spangler
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Crazy amount of bikers, most of them looks like your training for a triathlon and they’re speeding in between people. My friend got struck by somebody going way too fast and trying to squeeze between two lanes of traffic. I highly advise you to not come here if you’re walking, even on a bike it’s a little iffy

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Kate Orzikh
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Hiking
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Shanie Holman
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Hiking

The Back Bay is the best part of the ride, though the trail was starting to look interesting toward the end, too.

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Anthony B. Classik
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Road biking

Personally a top 5 trail in Orange County. You get a little bit of everything. Bay, nature, city, and community parks. There are many places to stop and exercise or take pictures. In my opinion, this trail should be rated “easy.” Access - You can park right outside of the Newport Dunes Resort for free. From there travel Northeast.

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S O
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMay 21, 2020
Mountain bikingNo shade

We started in Irvine (hear Harvard) and rode down to the trailhead in Newport Beach. Lovely ride, even though there's no shade. The wind in Back Bay was tough, but on the other hand it was 'pushing' us on the way back. The trail is almost perfectly flat, only a few hills and only one where I had to get off and walk the bike :)

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Luke Passey
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarAugust 9, 2019
Mountain bikingNo shade

Amazing, but a bit tiring. Even when it’s sunny if you’re biking there’s a nice breeze. I would do this again.

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David Haupt
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Road biking

This trail is definitely worth your time and energy. Whether walking, jogging, or biking it offers a scenic place to exercise while enjoying the views. Great views of the back bay in Newport Beach along with some open fields and creeks along the way. A wide variety of flowers and some wildlife along the duration of the trail. There can be a lot of traffic on the trail at times, but it's nice enough to expect this. Nicely maintained paved surface which is ideal for road biking. Plenty of other trails branch off this trail which offers even more variety. One of the better multi-purpose trails in OC.

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James & Leslie Fletcher
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Mountain biking

This is a wonderful ride.

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Andy H
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Very nice and safe trail from Irvine to balboa beach.

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Shawn E Bell
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Hiking

The Mountains to Sea trail is an all-day hike or bike ride (it's MORE than an all-day hike if you're in a physical condition best described as "perfect for watching TV"). It winds from the mountains (duh) to Newport Beach, and includes parts of different trails, including a beautiful part of the Back Bay trail in Newport Beach. Some of the parts of the trail are beautiful, some are following a big concrete ditch under roads and freeways. It's a great way to get in shape, given the rising and falling landscape. I'll be the first to admit that I'm not keen on changing my shape; it took me 40 years to end up looking like this, and I'm happy with it. I've made my peace with it. This is a shared trail; you'll meet bikes, horses, walkers, joggers, people wandering around lost, and people walking their dogs. Watch out for the bikers; they're generally kinda rude and it seems that they think their tight goofy-looking pants entitle them to trail ownership (kind of the same way heavyset people in spandex think they own the whole trailer park). The difficulty rating changes; it can be easy or moderate depending on where you are. I'm marking this one as moderate mostly due to the length. There is virtually no tree covering, so make sure you've got sunscreen and a hat. A good pair of walking shoes is a must if you're going to tackle the whole trail.

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Sukhraj Beasla
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJuly 13, 2010
Walking
First to Review

The Mountains to Sea trail is a big part of OC. It starts in Newport Beach, winds through Irvine, and some parts of Costa Mesa as well. Depending on your skill set, you can tackle different portions of the trail as they are split in sections based on intensity. I have walked or ran every inch of this trail since 2007 and enjoyed every aspect. It's great to work on hill training for marathons or practice speed runs at the Back Bay portion that starts in Newport Beach near the 73/405 freeway at Jamboree. The trail is shared by bikers and some will be courteous however others will provide no warning so be wary. In other respects, since the trail runs through various cities, it is very scenic and always fun.

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Leo Wang
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Hiking
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Jay M
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Road biking
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Ibrahim Shakhtour
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Hiking
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Jay M
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Road biking
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William Dyson
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Road biking
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David Huynh
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Hiking
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Natalie Binczewski
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Hiking
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Levi vega
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Hiking
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Charlie Nobles
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Running
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Joe Durre
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Hiking
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Francis Casola
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Hiking
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Joe Durre
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Mountain biking
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Aidan Syto
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Hiking
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DI YAO
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Road biking
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J Diaz
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Road biking
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Britney Becker
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Hiking
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Aaron Lininger
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Running
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Joanne L l
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Hiking
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James Heard
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Hiking
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