Harvard Square to Castle Island
How to get from Harvard Square to Castle Island on public transit, with the stops, times and the last trip of the night.
Harvard Square to Castle Island
- Red Line
- Bus 7
- Take the Red LineFrom Harvard, toward Braintree6 stops, about 13 min
- Walk about 2 min to Summer St @ South Station - Red Line entranceAfter you get off at South Station
- Take bus 7Toward City Point13 stops, about 14 min
- Get off at E Broadway @ Farragut RdThe stop after E Broadway @ P St
- Walk about 16 min to Castle Island
Weekdays, fall 2026 schedule · First and last trips
Quick answer: Take the Red Line toward Braintree to South Station, then bus 7 to E Broadway @ Farragut Rd, and walk about 16 min. The trip takes about 51 minutes (48-54 min depending on the connection). On weekdays bus 7 runs every 6 min during the day.
Get the live route from Harvard to Castle Island
Step by step
- At Harvard, take the Red Line toward Braintree.
- Ride 6 stops, about 13 min, through Central, Kendall/MIT, Charles/MGH, Park Street and Downtown Crossing, and get off at South Station.
- Walk about 2 min from South Station to Summer St @ South Station - Red Line entrance.
- At Summer St @ South Station - Red Line entrance, change to bus 7 toward City Point.
- Ride about 14 min (13 stops). Get off at E Broadway @ Farragut Rd, the stop after E Broadway @ P St.
- Walk about 16 min to Castle Island.
Other ways to go
- Take the Red Line toward Braintree to Andrew, then bus 10 to E Broadway @ Farragut Rd, and walk about 16 min: about 55 min.
- Take the Red Line toward Ashmont to Broadway, then bus 9 to E Broadway @ Farragut Rd, and walk about 16 min: about 55 min.
Which one is faster depends on when you leave. Cobblehop compares them with live times and gives you the one that gets you there first.
Times and frequency
| Day | First trip | Last trip | How often (daytime) | Trip time |
|---|---|---|---|---|
| Monday-Thursday | 5:21 am | 12:50 am | Every 6 min | About 51 min |
| Friday | 5:21 am | 1:07 am | Every 6 min | About 51 min |
| Saturday | 5:22 am | 12:52 am | About every 40 min | About 51 min |
| Sunday | 6:14 am | 12:37 am | Varies | About 51 min |
First and last trip are when the first train of the trip leaves Harvard, on the fall 2026 schedule. "How often" is for bus 7 (the least frequent part of the trip).
Late at night
On weekdays, the last trip that works leaves Harvard at 12:50 am and gets to Castle Island around 1:55 am, using bus 1 and bus 10. On Friday nights it runs later: the last trip leaves at 1:07 am. On Saturday nights the last trip leaves at 12:52 am, and on Sunday nights at 12:37 am. Late at night, ask Cobblehop for the last trip. It checks live times and tells you when to leave.
Tips for this trip
- Check the sign on the bus. Some bus 7 trips from Summer St @ South Station - Red Line entrance end early or go another way (City Point via East First St) and don't reach E Broadway @ Farragut Rd.
- Know your stop. Get to the door after E Broadway @ P St. The next stop is E Broadway @ Farragut Rd. Start a live trip in Cobblehop and it alerts you before your stop.
- Castle Island is at the end of Day Boulevard in South Boston. Fort Independence and Sullivan's are on the island.
Step-free access
MBTA data lists every station on this route (Harvard and South Station) as accessible. South Station has 9 elevators in MBTA data. Elevators do break, so check the MBTA's elevator alerts before you go.
What it costs
- Subway and bus. The subway is $2.40 one way, and a local bus is $1.70. Under an MBTA pilot that started September 1, 2026, you can change between bus and subway within 2 hours of your first tap and pay only the highest fare, if you use the same card or phone each time.
- How to pay. Tap a contactless credit or debit card, phone or watch at the fare gate or bus door, or use a CharlieCard or CharlieTicket.
- Kids. Children 11 and under ride the MBTA free.
Fares as of October 2026. Check the MBTA's fares page before you ride.
Harvard Square to Castle Island: common questions
How do I get from Harvard Square to Castle Island by public transit?
Take the Red Line toward Braintree to South Station, then bus 7 to E Broadway @ Farragut Rd, and walk about 16 min. The trip takes about 51 minutes (48-54 min depending on the connection).
How long does it take to get from Harvard Square to Castle Island?
About 51 minutes on the main route, or 48-54 minutes depending on the connection.
Do I have to change along the way?
Yes, once: at South Station. Take the Red Line toward Braintree to South Station, then bus 7 to E Broadway @ Farragut Rd, and walk about 16 min.
How often does bus 7 run?
Every 6 min on weekdays during the day and about every 40 min on Saturdays, on the fall 2026 schedule.
What time is the last train from Harvard Square to Castle Island?
On weekdays, the last trip that works leaves Harvard at 12:50 am and gets to Castle Island around 1:55 am, using bus 1 and bus 10. On Friday nights it runs later: the last trip leaves at 1:07 am. On Saturday nights the last trip leaves at 12:52 am, and on Sunday nights at 12:37 am.
Related routes
- Harvard Square to L Street Beach
- Harvard Square to Leader Bank Pavilion
- Kendall Square to Castle Island
- Back Bay Station to Castle Island
- Boston to Cambridge: Harvard and MIT (guide)
- Never miss your stop (guide)
More routes from Harvard Square
- Harvard Square to Logan Airport
- Harvard Square to JFK Presidential Library
- Harvard Square to Seaport World Trade Center
- Harvard Square to Boston Convention and Exhibition Center
- Harvard Square to the Seaport
- All routes from Harvard Square
Official sources
Cobblehop is independent and isn't affiliated with these agencies or operators. Schedules on this page come from MBTA/MassDOT public data. Check their pages for the latest schedules and service changes:
- MBTA: Red Line
- MBTA: bus 7
- MBTA: Harvard station
- MBTA: South Station station
- MBTA: fares
- MBTA: elevator and accessibility alerts
Published October 30, 2026. Times were computed from the fall 2026 MBTA schedule (2026-11-04 for weekdays). Service changes, so check Cobblehop for live times before you go.
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