Pasadena’s first modern transit-to-trails service launches this Saturday.

The six-month pilot program will connect the Metro Gold Line at Memorial Park Station with the Sam Merrill Trailhead in Altadena.

The service will run Saturdays and Sundays. Buses will leave every half-hour from the northbound Raymond Avenue and Holly Street bus stop between 7:05 a.m. to 4:35 p.m. The last bus will depart from the trailhead at 5 p.m. Travel time will be about 23 minutes.

The pilot program will run through Sept. 30.

An event to celebrate the launch will take place at 9 a.m. Saturday at Memorial Park.