The celebration for Kristin Armstrong’s second Olympic gold medal in the women's cycling time trial takes place Saturday — her 39th birthday — at 3 p.m. The ride starts at the Boise Depot and ends near the Idaho Statehouse.

Armstrong will sign autographs after the ride. The Idaho Statesman will be handing out commemorative “Perfect Ending” posters that Armstrong can sign.

The city is providing birthday cake for 1,000.

The following roads will be closed:

• Jefferson Street between 6th and 8th streets from 1:30 p.m. to 5 p.m. Bike racks will be set up in front of the Statehouse to allow bike parking for the cycling caravan.

• Capitol Boulevard from the Boise Depot to Jefferson Street from 3 p.m. to 4 p.m. There will be a rolling closure along Capitol Boulevard as the cycling caravan makes its way to the rally at Capitol Park.

• Capitol Boulevard, east lane, between Jefferson and Bannock streets from 1:30 p.m. to 5 p.m.

• Eastover Terrace: 8 a.m. to 3:30 p.m. There will be no vehicular access and no parking at the Boise Depot. Access to the depot will be available only by bicycle or on foot.

Joining the ride:

Cyclists 5 and younger, who may not be able to ride the entire length of Capitol Boulevard, can gather with their parents at City Hall Plaza at Capitol Boulevard and Main Street and join Armstrong and the bicycle caravan as it passes. Parents are advised to have their children on the plaza by 3 p.m.

All other cyclists can gather at the Boise Depot with Armstrong at 2:30 p.m. or in the parking lot along Capitol on the Boise State campus directly north of the new Micron Business and Economics Building, where they can join the caravan as it comes down the hill.

The cycling caravan will depart the depot at 3 p.m. and travel to Capitol Park for the rally and birthday celebration.

Non-cyclists are encouraged to line Capitol Boulevard and welcome Armstrong as she rides into Capitol Park.