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ChChChANGES to the Boston Marathon schedule Monday due to cold, rainy weather in the morning.

NOW, Wave 4 starts RIGHT after Wave 3 begins. Normally there’s a 25 minute gap. Read more..

Weather forecast prompts schedule change for 2019 Boston Marathon - The Boston Globe

The Boston Athletic Association on Friday announced weather-related changes to Monday's Boston Marathon schedule to ensure the safety of participants, pushing the Wave 4 start time immediately behind Wave 3 (10:50 a.m.).