Groton School District Snow Day Predictor

Q: How does Groton announce a snow day?

By the district app and the district website, and on the district’s own closings page.

Q: How long is a delayed start in Groton?

2 hours: on a delay morning every school starts that much later.

Q: When is the last day of school for Groton?

June 14, 2027, on the district’s 2026 to 2027 calendar.

Q: How much snow does Mystic get?

About 17 inches a winter at a NOAA weather station 2.7 miles away, averaged over 9 winters. Between December 1 and March 31 that brings 1.7 weekday mornings a year with 2 inches of new snow or more, and 0.7 with 4 inches or more.

Q: What was the biggest snow day near Groton?

13 inches on January 30, 2022, the largest single day at a NOAA weather station 2.7 miles away in 9 winters. The snowiest winter was 2025 to 2026, with 43.9 inches.

Q: How does the Groton snow day predictor work?

It reads the National Weather Service forecast for Mystic through the night and the 5 to 8 am bus run, adds winter alerts and the Winter Storm Severity Index, and measures the snow against Groton’s own big snow morning: 4.8 inches, the top tenth of snowy weekday mornings at a NOAA weather station 2.7 miles away.

The next three school mornings

Will Groton close tomorrow?

Reading the National Weather Service forecast for the overnight and the bus hours in Mystic.

The Groton playbook

How Groton calls a snow day

How families hear

By the district app and the district website.

“Notice of such closing is broadcast through ParentSquare and on our GPS website at www.grotonschools.org.”

Groton Middle School Handbook 2026-2027

A 2 hour delay

On a delay morning every school starts 2 hours late.

“2 hour Delayed Opening - (emergency/weather related) Preschool (TRMS, ECC-MM) - A.M. No classes Preschool (TRMS) - P.M. 12:48 pm - 3:35 pm Prekindergarten(ECC-MM) 11:00 am - 3:35 pm Elementary (K-5) 11:00 am - 3:35 pm”

Delay schedule

Making up a lost day

Snow make-up days June 15 to 17, after the tentative last day.

Make up dates: Jun 15, Jun 16, Jun 17.

“14 Tentative Last Day of School, Early Dismissal ... 15-17 Snow Make-Up day”

Source

The 2026 to 2027 calendar

First day August 31, 2026
Winter break Dec 24 to Jan 1
February break Feb 15 to Feb 16
Last day June 14, 2027

District calendar

Read from Groton’s own pages on October 8, 2026; the district site is grotonschools.org.

Ten winters of school mornings

Groton’s snow record

17inches of snow a winter

1.7school mornings a winter with 2 in of new snow or more

0.7with 4 in or more

4.8 ina big snow morning in Groton: the top tenth of snowy school mornings

0.7Nov

2.9Dec

6.2Jan

6.5Feb

0.7Mar

Average snowfall by month, inches

Biggest day 13 in on January 30, 2022
Snowiest winter 2025 to 2026, 43.9 in
6 in mornings 0.4 a winter
1 in mornings 2.6 a winter

Measured at a NOAA weather station 2.7 miles away. Mornings are the 7 am snow reading on a weekday from December 1 through March 31, over the ten winters from 2016 to 2017 through 2025 to 2026, from NOAA GHCN Daily.

The Connecticut rule

How Connecticut counts a lost day

Connecticut requires at least 180 days and 900 hours of actual school work, counting no more than 7 hours a day.

The Connecticut rules in the agency’s own words, and every Connecticut district

Next door

Districts near Groton

District	Snow a winter	4 in mornings
Ledyard School DistrictLedyard	17 in	0.7
New London School DistrictNew London	27.3 in	1.5
Waterford School DistrictWaterford	27.3 in	1.5
Stonington School DistrictPawcatuck	14.6 in	0.9
Montville School DistrictOakdale	24.4 in	1.3
East Lyme School DistrictEast Lyme	23.2 in	1

The schools

7 schools

Every school in Groton follows the district’s call: one closing covers them all.

High

Robert E. Fitch High School, Groton

Middle

Groton Middle School, Groton

Elementary

Thames River Magnet School, Groton
Mystic River Magnet School
Northeast Academy Magnet School
Catherine Kolnaski Magnet School, Groton
Charles Barnum Magnet School, Groton

Questions

Groton snow day questions

How does Groton announce a snow day?

How long is a delayed start in Groton?

When is the last day of school for Groton?

How much snow does Mystic get?

What was the biggest snow day near Groton?

How does the Groton snow day predictor work?

How does Connecticut handle snow days?

More winter

More for Connecticut snow days

Snow day predictorClosing and delay odds for any ZIP, with the snowiest districts in the country.Snow depth mapHow much snow is on the ground right now, measured, across the country.First snow datesWhen the first measurable snow usually lands where you live.Frozen pipesThe nights cold enough to freeze a pipe, and what to do before one.Snow plow trackerWhere the plows are during a storm, city by city.Connecticut winter forecastThe season ahead for Connecticut: snowfall, cold and the first snow.

A residential street under deep snow on a bright blue morning, cars parked along the curb buried into smooth white mounds, one set of tire tracks down the middle — The morning after a big one: cars buried to the mirrors and one set of tracks down the middle. A street like this is a closing, no debate. Photo, Fairfax, Virginia, January 2016: Jarek Tuszyński, CC BY 4.0

The odds are a forecast read, and the superintendent makes the call: the district’s own announcement is the one to follow.