Oakville 21.1 Half Marathon

This edition is listed as Half Marathon in Oakville, Ontario, Canada.

Typical race-morning air at Oakville 21.1 Half Marathon averages 15°C across the last 10 years (about 6°C to 24°C in that window). The morning can still warm as you run. Use that range for planning, not as a promise for race day.

Inside about 14 days, use the live forecast on this page. The current outlook is about 12°C to 15°C, around 11 km/h wind and 80% humidity. Forecasts move. Further out, use race morning history, not a locked plan.

Heat, humidity, wind or a lumpier day than you hoped all raise the chance of a late fade. If the start feels easy, don't spend it. Back off early, and hold even effort even if that means slower than the A-goal. The preview on this page is the starting point. Full personalised splits sit in Race Pass or Pro.

About 85 m of climbing and 86 m of descent. Rolling. Almost all of it sits within 2%. No steep grades over 6%. No counted climbs.

It is an estimate of how the course and conditions could move your baseline. Your body still decides the rest: heat adaptation, fuelling, prep, mindset, how you race, and whether you can draft.

The free page covers conditions, course context and a finish preview. Full personalised pacing and weather-adjusted splits sit in Race Pass or Pro.