Current Time in Groton, Middlesex County, Massachusetts, USA

5:03:20 AM

05:03:20

EDT (Eastern Daylight Time) · UTC−04:00

America/New_York

Clock format
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Time zone details

Groton is observing daylight saving time in 2026

Daylight in Groton

Sunrise7:12 AMSolar noon12:30 PMSunset5:47 PM
Next clock changeNov 1, 2026 · Clocks move back 1 hour · in 5 days 20 hoursUpcomingView detailsWeather nowLoading current forecast…Forecast details

Location facts

Place

Country
USA
State
Massachusetts
County
Middlesex County
Place type
Populated place
Country currency
US Dollar (USD)

Practical

Country languages
English, Spanish, Hawaiian, French
Dialing code
+1
Population
1,124
Elevation
101 m

Geography

Geographic coordinates
42° 36' N / 71° 34' W
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Clock changes in Groton

Next clock change

Upcoming

2:00 AM EDT1:00 AM EST

Clocks move back 1 hour

2026

  1. past

    Daylight saving time starts

    2:00 AM EST3:00 AM EDT

    Clocks move forward 1 hour

  2. upcoming

    Daylight saving time ends

    2:00 AM EDT1:00 AM EST

    Clocks move back 1 hour

Future clock changes, 2027–2030
USA daylight saving timeClock changes worldwide

Sun & Moon details

Sun

Sunrise
Solar noon
Sunset
Daylight duration
10 hr 34 min2 min 40 sec shorter than the previous day

Twilight

Civil twilight
–
Nautical twilight
–
Astronomical twilight
–
Full MoonMoon illumination99%
View full Sun & Moon detailsHide full Sun & Moon details

Monday, October 26, 2026

View Groton on SavvyTime's time-zone map

Sun

Sunrise
Sunset
Day length
10 hr 34 min2 min 40 sec shorter than the previous day
Solar noon
(34.8° altitude)

Civil twilight

Dawn to dusk
–

Additional twilight

Nautical dawn to dusk
–
Astronomical dawn to dusk
–

Moon

Phase
Full Moon (99% illuminated)
Moonrise
Moonset
Previous principal phase
Full Moon — Monday, October 26, 2026 at
Next principal phase
Third Quarter — Sunday, November 1, 2026 at

Seven-day daylight outlook

Sunrise, sunset, and daylight for seven local dates
Local dateSunriseSunsetDay lengthDaily change
10 hr 34 min2 min 40 sec shorter than the previous day
10 hr 32 min2 min 39 sec shorter than the previous day
10 hr 29 min2 min 37 sec shorter than the previous day
10 hr 27 min2 min 37 sec shorter than the previous day
10 hr 24 min2 min 35 sec shorter than the previous day
10 hr 21 min2 min 35 sec shorter than the previous day
10 hr 19 min2 min 33 sec shorter than the previous day

Weather forecast for Groton

Temperature unit

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Plan around Groton

Upcoming public holidays in Massachusetts

  1. Veterans Day
  2. Thanksgiving Day
  3. Christmas Day

Nearby places

WestfordMiddlesex County12 kmEChelmsfordMiddlesex County17 kmELeominsterWorcester County18 kmSWActonMiddlesex County18 kmSEFitchburgWorcester County19 kmWNashuaHillsborough County19 kmNELowellMiddlesex County21 kmEDracutMiddlesex County23 kmEConcordMiddlesex County25 kmSEBillericaMiddlesex County26 kmETewksburyMiddlesex County28 kmESudburyMiddlesex County28 kmSE
Browse places in USA

Frequently asked questions

What time zone is Groton in?
Groton uses Eastern Standard Time (EST, UTC−5) in winter and Eastern Daylight Time (EDT, UTC−4) in summer. Its IANA time zone is America/New_York.
When is the next clock change in Groton?
Clocks in Groton move backward 1 hour on Sunday, November 1, 2026 at 2:00 AM, changing from EDT (UTC−04:00) to EST (UTC−05:00)
Does Groton observe daylight saving time?
Yes. Groton observes daylight saving time: EDT (UTC−4) in summer and EST (UTC−5) in winter.
What is the UTC offset of Groton?
Groton is UTC−5 in winter and UTC−4 in summer