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Routes
Road cycling routes
United States
California
Orange County
Tustin

Mountains to Sea and Back Bay Loop

Easy

2.9

(18)

22

riders

Mountains to Sea and Back Bay Loop

01:55

40.7km

220m

Road cycling

Embark on the Mountains to Sea and Back Bay Loop, an easy racebike route that guides you through a diverse landscape in Orange County, California. You will cycle 25.3 miles (40.7 km), gaining 726 feet (221 metres) in elevation, with an estimated duration of 1 hour and 54 minutes. Experience…

Last updated: April 23, 2026

Waypoints

A

Start point

Train Station

Get Directions

1

3.77 km

San Diego Creek Trail

Highlight (Segment) • Cycleway

This section of the San Diego Bike Trail runs from Jamboree Rd to Harvard Ave, and is about 4mi (6.5km) in length. It connects the Back Bay Drive and Back …

Tip by

2

11.2 km

Back Bay Loop Trail

Highlight (Segment) • Trail

Paved trail, about 3.5km (or 2.2mi) in length, on the north side of the Upper Newport Bay Nature Preserve. It starts/ends on Irvine Ave and Jamboree, takes you away from the busy roads and offers great views.

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3

19.2 km

Newport Bay

Highlight • Beach

Newport Bay is also known as Newport Harbor. It is a picturesque coastal inlet in Southern California and famous for its upscale waterfront homes, marinas, and vibrant boating scene.

Tip by

B

40.7 km

End point

Train Station

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Way Types & Surfaces

Way Types

35.3 km

2.68 km

1.25 km

940 m

542 m

Surfaces

23.8 km

16.7 km

121 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

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Weather

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Today

Wednesday 6 May

22°C

11°C

0 %

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Max wind speed: 15.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

Is the Mountains to Sea and Back Bay Loop suitable for beginners?

Yes, this route is generally considered easy and suitable for beginners, especially for road cycling. Both the Mountains to Sea Trail and the Back Bay Loop Trail feature mostly paved surfaces and gentle grades, making for a comfortable ride. The Back Bay Loop, in particular, is known for being flat and family-friendly.

What is the terrain like on this cycling route?

The terrain is predominantly paved, consisting of asphalt and some concrete sections. While mostly flat, there are a couple of slight hills, particularly on the Back Bay Loop. The Mountains to Sea Trail also includes some parts that follow concrete water channels. Overall, it's a smooth ride suitable for racebikes.

What kind of scenery can I expect along the route?

You'll experience a diverse range of scenery. The Mountains to Sea Trail takes you through parts of the Irvine Ranch Land Reserve, offering views of oak-filled areas, parks, and urban landscapes. The Back Bay Loop Trail provides picturesque views of coastal wetlands, the Upper Newport Bay Nature Preserve, shimmering bay waters, and bluffs of coastal sage scrub, especially at Castaways Park.

Can I see wildlife on this trail?

Yes, the Back Bay Loop Trail is particularly renowned for its abundant wildlife, especially birds. You can often spot egrets, herons, and ospreys in the Upper Newport Bay Nature Preserve and Ecological Reserve, making it a popular spot for birdwatching.

Where can I park to access the Mountains to Sea and Back Bay Loop?

There are multiple entry points and parking options, especially along the Back Bay Loop. For example, you can find parking near the Peter and Mary Muth Interpretive Center or other access points around the Upper Newport Bay area. Specific parking details can often be found on local city or park websites like newportbeachca.gov.

Are there any permits or entrance fees required for this cycling route?

Generally, there are no permits or entrance fees required to cycle the Mountains to Sea and Back Bay Loop trails themselves. The trails are publicly accessible. However, always check for specific regulations if you plan to visit facilities within the Upper Newport Bay Nature Preserve, though typically access to the trails is free.

Is the Mountains to Sea and Back Bay Loop dog-friendly?

While the trails are popular for outdoor activities, specific dog regulations can vary by section and park. The Back Bay Loop is generally considered family-friendly, but it's best to check the specific rules for dogs in the Upper Newport Bay Nature Preserve and along the various segments of the Mountains to Sea Trail. Often, dogs are permitted on leash on paved trails, but may be restricted in sensitive wildlife areas.

What is the best time of year to cycle this route?

The route can be enjoyed year-round due to Southern California's mild climate. Spring and fall offer pleasant temperatures, making them ideal. Summer can be warm, so early mornings or late afternoons are preferable. Winter is also a good time, with cooler weather and fewer crowds.

Are there restrooms and water available along the route?

Yes, particularly along the Back Bay Loop Trail, you will find amenities such as restrooms and water fountains. There are also educational facilities like the Peter and Mary Muth Interpretive Center and the Back Bay Science Center which may offer facilities.

Does the route connect to other trails?

Yes, the route seamlessly connects to several other paths. The Back Bay Loop Trail links directly with the Mountains to Sea Trail. Additionally, the route passes through sections of the California Mission Trail - stage 03 San Juan Capistrano to Mission San Gabriel Arcangel, San Diego Creek Bike Trail, and Peters Canyon Bikeway, among others, allowing for extended rides and exploration.

What should I bring for a ride on this loop?

Given the route's length and exposure, it's advisable to bring plenty of water, sun protection (sunscreen, hat, sunglasses), and snacks. A helmet is essential for safety. While there are some amenities, carrying basic bike repair tools and a first-aid kit is always a good idea. Don't forget binoculars if you're interested in birdwatching!

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