SudburyROCKS!!! Marathon

About the Event

2026 registration is now open! Join us for another unforgettable edition of SudburyROCKS!!!, where runners and walkers come together for a fun, active, and community-focused event. In 2025, the 20th Anniversary of SudburyROCKS!!! drew over 2,000 participants and more than 300 volunteers, raising an estimated $60,000 for the Health Sciences North Foundation through fundraising and event proceeds. This year promises the same excitement, energy, and impact! Whether you’re racing, walking, or volunteering, you’ll be part of a day that celebrates fitness, community, and giving back. Don’t miss out — register today and be part of SudburyROCKS!!! 2026!

Races Offered

10km

May 25, 2025

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Distance — 10K

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5K Run

May 25, 2025

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Distance — 5K

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5K Walk

May 25, 2025

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Distance — 5K

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Half Marathon

May 25, 2025

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Distance — 21.1K

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Marathon

May 25, 2025

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Distance — 42.2K

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Marathon Relay

May 25, 2025

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Distance — 42.2K

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Marathon Walk

May 25, 2025

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Distance — 42.2K

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Weather History

These values represent the 3-year monthly averages for May in Greater Sudbury.

thermostat Temperature

5.8° / 17.8°

wb_sunny Feels like

2.2° / 14.7°

light_mode Avg sunshine hours

10h 51m

water_drop Avg rainfall

2.1 mm

ac_unit Avg snowfall

—

air Avg wind speed

11.6 km/h (Light breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (4.2)

humidity_mid Humidity

66.5%

wb_twilight Sunrise

05:49

nightlight Sunset

20:51

About Greater Sudbury

Learn more about the host city, Greater Sudbury.

Greater Sudbury, also known as Sudbury, is the most populous city in Northern Ontario with a population of 166,004 in 2021. Greater Sudbury is the only single-tier municipality in Northern Ontario, the largest city in Ontario by area and the fifth largest in Canada. The city is separate from, but entirely surrounded by the Sudbury District.