Distance between cities › USA › California › Half Moon Bay, CA › Distance from Half Moon Bay to Portola Valley Book Hotels

Distance from Half Moon Bay, CA to Portola Valley, CA

Distance

21 mi

Time

31 minutes

Gas Cost

$3 - $7

Helpful Inaccurate

There are 11.98 miles from Half Moon Bay to Portola Valley in southeast direction and 21 miles (33.80 kilometers) by car, following the I-280 route.

Half Moon Bay and Portola Valley are 31 minutes far apart, if you drive non-stop .

This is the fastest route from Half Moon Bay, CA to Portola Valley, CA. The halfway point is Palomar Park, CA.

Half Moon Bay, CA and Portola Valley, CA are in the same time zone (PDT). Current time in both locations is 4:21 pm.

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Lowest Price Rental Cars in Half Moon Bay, CA

Planning on renting a car to go from Half Moon Bay, CA to Portola Valley, CA? Here there are some offers to rent a car in Half Moon Bay, CA

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Half Moon Bay »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 0.85 gallons of gas to cover the route between Half Moon Bay, CA and Portola Valley, CA.

The estimated cost of gas to go from Half Moon Bay to Portola Valley is $4.72.

During the route, an average car will release 16.70 pounds of CO₂ to the atmosphere. The carbon footprint would be 0.79 pounds of CO₂ per mile.

Average USA gas price used for calculation is $5.54 per gallon of regular gas. Price last updated on March 18, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Half Moon Bay, CA and Portola Valley, CA

If you want to meet halfway between Half Moon Bay, CA and Portola Valley, CA or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 37.490925 and -122.300644, or 37º 29' 27.33" N, 122º 18' 2.3184" W. This location is 10.61 miles away from Half Moon Bay, CA and Portola Valley, CA and it would take approximately 15 minutes to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Palomar Park, CA, situated 15 miles from Half Moon Bay, CA and 12 miles from Portola Valley, CA. It would take 21 minutes to go from Half Moon Bay to Palomar Park and 16 minutes to go from Portola Valley to Palomar Park.