{"publisher":{"name":"MediaBias News","url":"https://mediabias.news","methodology":"https://mediabias.news/methodology","editorialPrinciples":"https://mediabias.news/editorial-principles","corrections":"https://mediabias.news/corrections"},"scoreGuide":{"trust":"How well corroborated and evidenced the source reporting is. 0-100, higher is better.","critic":"Craft quality of the source journalism: context, balance, fact vs comment. 0-100, higher is better.","hype":"How far the source presentation runs ahead of substance. 0-100, LOWER IS BETTER.","scope":"Scores assess the original reporting this article was written from, not the truth of the underlying event and not the quality of this write-up."},"assessmentGuide":{"type":"coverage-and-source-reporting-analysis","factCheck":{"status":"not-performed","note":"Media Bias News compares coverage and scores the source reporting. It does not currently publish a ClaimReview verdict on whether the underlying event or claim is true."},"sourceFactuality":{"note":"Factuality values describe published ratings of the outlets that covered the story. They are not a factuality verdict on this story or its claims."}},"story":{"id":"https://mediabias.news/climate/us-marathons-shift-dates-and-rules-as-climate-change-raises-race-day-heat","slug":"us-marathons-shift-dates-and-rules-as-climate-change-raises-race-day-heat","url":"https://mediabias.news/climate/us-marathons-shift-dates-and-rules-as-climate-change-raises-race-day-heat","title":"US marathons shift dates and rules as climate change raises race-day heat","subtitle":"Organisers move start times, offer shorter courses and delay events to avoid dangerous temperatures for runners","excerpt":"Marathon organisers across the US are adjusting race dates, start times and course lengths after record heat forced cancellations and prompted safety concerns. The Twin Cities Marathon will move its 2027 event to later in October, following a 2023 cancellation due to extreme temperatures.","category":"Climate","area":"United States","publishedAt":"2026-08-13T17:25:34.731Z","sourceReportedAt":"2026-08-13T13:22:23.000Z","updatedAt":"2026-08-13T17:25:34.731Z","readTime":"4 min read","scores":{"trust":77,"critic":65,"hype":15,"notes":{"trust":"Two independent full reports corroborate key facts","critic":"Full reports quote affected parties and name specifics","hype":"Headline matches body; no sensationalism detected"}},"tags":["#ClimateChange","#USMarathons","#ExtremeHeat","#PublicHealth","#SportsSafety"],"entities":["Paul Grinvalds","Twin Cities Marathon","Climate Central","World Meteorological Organization","Minneapolis-St. Paul","Los Angeles Marathon"],"body":[{"type":"key_takeaways","items":["The Twin Cities Marathon will move its 2027 race from the first Sunday in October to later in the month after record heat forced its 2023 cancellation.","Organisers of other marathons, including in Sioux Falls, Los Angeles and Little Rock, have already shifted dates or start times to avoid high temperatures.","Climate Central research predicts that by 2045, 46 of 51 major US marathons will have fewer days with optimal running conditions in the low 40s Fahrenheit.","No right-rated outlet in the sample below carried this story, though 17 left- and centre-rated outlets did."]},{"type":"paragraph","text":"Paul Grinvalds, a 68-year-old runner from West Des Moines, Iowa, has completed 114 marathons across all 50 US states. He told the Associated Press that temperatures above 60°F (15.5°C) make races difficult, and that runners often push themselves despite the risks. His experience reflects broader concerns among marathon organisers as climate change drives up temperatures."},{"type":"paragraph","text":"The Twin Cities Marathon in Minneapolis-St. Paul will move its 2027 race from the first Sunday in October to later in the month. The decision follows the 2023 cancellation due to record heat and humidity, and a 2025 race that started near 70°F (21°C). Race director Ed Whetham called the 2023 cancellation \"devastating\" and said organisers now prefer a 39°F (4°C) start over a 70°F one."},{"type":"paragraph","text":"Other marathons have made similar changes. The Sioux Falls Marathon moved its 2025 race from August to September after cancelling in 2024 due to heat. The Air Force Marathon in Dayton, Ohio, the Little Rock Marathon in Arkansas and the Long Beach Marathon in California have all moved start times earlier to avoid high temperatures. In Los Angeles, organisers gave runners the option to stop after 18 miles and still receive a finishers medal, with fewer than 5% taking the offer."},{"type":"paragraph","text":"Climate Central, a research group, studied 221 marathons and found that by 2045, 46 of 51 major US races will have fewer days with optimal running conditions in the low 40s Fahrenheit (6-7°C). The Earth had its hottest year on record in 2024, and the World Meteorological Organization forecasts that global temperatures will likely rise by more than 1.5°C (2.7°F) above pre-industrial levels between 2025 and 2030."},{"type":"heading","text":"What the coverage left out"},{"type":"paragraph","text":"No right-rated outlet in the sample below carried this story. None of the centre-rated digests mentioned the World Meteorological Organization’s projection that global temperatures will likely rise by more than 1.5°C above pre-industrial levels by 2030, or named the burning of coal and gasoline as the primary cause of climate change. The left-rated digests did not include the specific start times that marathons like the Air Force Marathon and Little Rock Marathon have moved to."}],"basedOn":[{"sourceName":"The Seattle Times","url":"https://seattletimes.com/nation-world/warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:22:23.000Z"},{"sourceName":"Washington Top News","url":"https://wtop.com/lifestyle/2026/08/the-warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:07:00.000Z"},{"sourceName":"The Toronto Star","url":"https://thestar.com/news/world/united-states/the-warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool/article_cb979a18-141e-59d5-bb04-aab59a4e8de0.html","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:03:22.000Z"},{"sourceName":"Medicine Hat News","url":"https://medicinehatnews.com/sports/national-sports/2026/08/13/the-warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:03:22.000Z"},{"sourceName":"Newsday","url":"https://newsday.com/lifestyle/climate-marathons-running-heat-j25329","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:02:22.129Z"},{"sourceName":"The Independent","url":"https://independent.co.uk/news/iowa-des-moines-earth-west-des-moines-southern-california-b3032538.html","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:01:46.000Z"},{"sourceName":"Associated Press News","url":"https://apnews.com/article/climate-marathons-running-heat-3f162360487d57bf55ba25de24320a46","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:01:46.000Z"},{"sourceName":"The Independent Online","url":"https://dailyindependent.com/national/the-warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool/article_bb80f956-8815-5b2f-9119-0727121a5284.html","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:01:46.000Z"},{"sourceName":"Yankton Press & Dakotan","url":"https://yankton.net/national_sports/article_53026310-5f0f-591e-a1a2-a9c202e4dd94.html","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:01:46.000Z"},{"sourceName":"The Northern Virginia Daily","url":"https://nvdaily.com/associated_press_national/the-warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool/article_914f1392-96b0-5760-bcfd-b6953f122e5c.html","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","angle":"","publishedAt":"2026-08-13T13:01:46.000Z"},{"sourceName":"Yuma Sun","url":"https://yumasun.com/sports/national_sports/the-warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool/article_aeab1756-882e-5a2e-ac5c-334c82181030.html","headline":"The warming climate is forcing marathons to consider changes to keep runners 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The Associated Press and Washington Top News, whose full reports were reprinted by left-rated outlets, both quoted Andy Pershing of Climate Central: \"The ability to go outside, to exercise, to take advantage of your human body and being healthy, that’s something that’s getting challenged by climate change.\"","The left-rated digests carried the forecast that 46 of 51 US marathons will have fewer optimal running days by 2045. They also included the World Meteorological Organization’s projection that global temperatures will likely rise by more than 1.5°C above pre-industrial levels by 2030. The full reports named the burning of coal and gasoline as the primary cause of climate change.","The Associated Press report quoted Jessica Murfree of the University of North Carolina-Chapel Hill, who said the concern extends beyond marathons to whether people can exercise outdoors at all on increasingly warm days. The left-rated digests carried her statement that organisers of marathons, bicycle races and other sports must adopt safety measures as climate change makes weather hotter and more volatile."],"centre":["The ten centre-rated digests led on the operational changes marathons are making. They all mentioned the Twin Cities Marathon’s decision to move its 2027 race to later in October, and several noted that other races have shifted dates or start times. The digests from The Northern Virginia Daily, Yuma Sun and goSkagit included the Los Angeles Marathon’s option for runners to stop after 18 miles.","The centre-rated digests carried the 2023 cancellation of the Twin Cities Marathon due to record heat and humidity, and the 2025 race’s start near 70°F (21°C). They also mentioned the Sioux Falls Marathon’s move from August to September after its 2024 cancellation. The Washington Top News full report, reprinted by centre-rated outlets, included the Climate Central forecast that 46 of 51 US marathons will have fewer optimal running days by 2045.","None of the centre-rated digests mentioned the World Meteorological Organization’s projection that global temperatures will likely rise by more than 1.5°C above pre-industrial levels by 2030. None named the burning of coal and gasoline as the primary cause of climate change, and none quoted Jessica Murfree’s statement about the broader impact on outdoor exercise."],"right":[],"comparison":""},"blindspot":null,"sourceFactualityDistribution":{"mixed":1,"high":13,"unknown":3},"ownershipDistribution":{"privateEquity":2,"mediaConglomerate":6,"independent":2,"corporation":1},"firstDatedReport":{"sourceName":"Winnipeg Free Press","url":"https://winnipegfreepress.com/arts-and-life/life/2026/08/13/the-warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool","publishedAt":"2026-08-13T08:03:22.000Z"},"countries":[{"country":"Winnipeg, Manitoba, Canada","count":1},{"country":"Hamilton, Ontario, Canada","count":1},{"country":"Orlando, Orange County, Florida, United States","count":1},{"country":"Jacksonville, Duval County, Florida, United States","count":1},{"country":"Detroit, Wayne County, Michigan, United States","count":1},{"country":"London, Greater London, England, United Kingdom","count":1},{"country":"New York, New York, United States","count":1},{"country":"Kentucky, United States","count":1},{"country":"Melville, Suffolk County, New York, United States","count":1},{"country":"Toronto, Ontario, Canada, Canada","count":1},{"country":"Chevy Chase, Montgomery County, Maryland, United States","count":1},{"country":"Seattle, King County, Washington, United States","count":1}],"outlets":[{"name":"Winnipeg Free Press","url":"https://winnipegfreepress.com/arts-and-life/life/2026/08/13/the-warming-climate-is-forcing-marathons-to-consider-changes-to-keep-runners-cool","headline":"The warming climate is forcing marathons to consider changes to keep runners cool","publishedAt":"2026-08-13T08:03:22.000Z","leaningSide":"centre","leaningRating":"center","factualityRating":"high","angle":null,"isOpinion":false,"country":"Winnipeg, Manitoba, Canada","repostedFrom":"Associated Press News"},{"name":"The Hamilton 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