The current cost of an Annual Membership is $163 / year or $14.95 / month. Please see the Annual Membership page for more details.
Day passes can be purchased for $12 and 3-Day passes can be purchased for $24 at any kiosk (see step by step instructions).
Day passes cover the first 30 minutes of each trip; after 30 minutes there are usage fees for each half hour the bike is in rental. You can take as many 30 minute rides as you like! As a member you get 45 minutes instead of 30.
If you find that you are close to the 30 minute mark (or for annual members, 45 minute mark), you can dock your bike at any Citi Bike station, and wait two minutes and take out another bike.