Thunder Bay is on the same time as Atikokan in winter and 1 hour ahead in summer. Updated for the 2026 time zone changes and current daylight saving rules.
| Starting | Thunder Bay is | Atikokan / Thunder Bay |
|---|---|---|
| Nov 1, 2026 | same time | UTC−5 / UTC−5 |
| Mar 14, 2027 Thunder Bay springs forward | 1 hour ahead | UTC−5 / UTC−4 |
| Nov 7, 2027 Thunder Bay falls back | same time | UTC−5 / UTC−5 |
Eastern Standard Time. UTC−5 all year, with no daylight saving time.
Eastern Time. UTC−5 in winter and UTC−4 from the second Sunday in March to the first Sunday in November.
Winter: A 9-to-5 workday overlaps for the full 8 hours: 9:00 AM to 5:00 PM in Atikokan, which is 9:00 AM to 5:00 PM in Thunder Bay.
Summer: A 9-to-5 workday overlaps for 7 hours: 9:00 AM to 4:00 PM in Atikokan, which is 10:00 AM to 5:00 PM in Thunder Bay.
Atikokan has never used daylight saving time. It stays on Eastern Standard Time (UTC−5) all year, so it matches Thunder Bay in winter and is an hour behind it in summer.
Thunder Bay is on the same time as Atikokan in winter and 1 hour ahead in summer.
Atikokan uses Eastern Standard Time: UTC−5 all year, with no daylight saving time. Thunder Bay uses Eastern Time: UTC−5 in winter and UTC−4 from the second Sunday in March to the first Sunday in November.
In winter: A 9-to-5 workday overlaps for the full 8 hours: 9:00 AM to 5:00 PM in Atikokan, which is 9:00 AM to 5:00 PM in Thunder Bay. In summer: A 9-to-5 workday overlaps for 7 hours: 9:00 AM to 4:00 PM in Atikokan, which is 10:00 AM to 5:00 PM in Thunder Bay.
Atikokan has never used daylight saving time. It stays on Eastern Standard Time (UTC−5) all year, so it matches Thunder Bay in winter and is an hour behind it in summer.