Kendall Square to Castle Island
The T route from Kendall Square to Castle Island: where to board, where to change, where to get off and how late it runs.
Kendall Square to Castle Island
- Red Line
- Bus 7
- Take the Red LineFrom Kendall/MIT, toward Braintree4 stops, about 7 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 43 minutes (41-46 min depending on the connection). On weekdays bus 7 runs every 6 min during the day.
Get the live route from Kendall to Castle Island
Step by step
- At Kendall/MIT, take the Red Line toward Braintree.
- Ride 4 stops, about 7 min, through 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 47 min.
- Take the Red Line toward Braintree to Broadway, then bus 9 to E Broadway @ Farragut Rd, and walk about 16 min: about 48 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 | 5:27 am | 12:59 am | Every 6 min | About 43 min |
| Friday | 5:27 am | 1:12 am | Every 6 min | About 43 min |
| Saturday | 5:28 am | 12:58 am | About every 40 min | About 43 min |
| Sunday | 6:20 am | 12:42 am | Varies | About 43 min |
First and last trip are when the first train of the trip leaves Kendall/MIT, 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 Kendall/MIT at 12:59 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 1:12 am. On Saturday nights the last trip leaves at 12:58 am, and on Sunday nights at 12:42 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.
- Kendall/MIT station is on Main Street in Kendall Square, at the east end of MIT.
Step-free access
MBTA data lists every station on this route (Kendall/MIT 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.
Kendall Square to Castle Island: common questions
How do I get from Kendall 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 43 minutes (41-46 min depending on the connection).
How long does it take to get from Kendall Square to Castle Island?
About 43 minutes on the main route, or 41-46 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 bus from Kendall Square to Castle Island?
On weekdays, the last trip that works leaves Kendall/MIT at 12:59 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 1:12 am. On Saturday nights the last trip leaves at 12:58 am, and on Sunday nights at 12:42 am.
Related routes
- Kendall Square to L Street Beach
- Kendall Square to Leader Bank Pavilion
- Back Bay Station to Castle Island
- North Station to Castle Island
- Never miss your stop (guide)
More routes from Kendall Square
- Kendall Square to JFK Presidential Library
- Kendall Square to Seaport World Trade Center
- Kendall Square to Boston Convention and Exhibition Center
- Kendall Square to the Seaport
- Kendall Square to Carson Beach
- All routes from Kendall 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: Kendall/MIT 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.
Leaving now? Cobblehop gives you one clear plan with live times and alerts you before your stop. No sign-up, nothing to install.