Miami-Dade's Chief Heat Officer and Extreme Heat Action Plan
In 2021 Miami-Dade County created what it and its funder both call the world's first Chief Heat Officer, seeded by an Adrienne Arsht-Rockefeller Foundation challenge grant; Athens named Europe's first that July. The post produced a December 2022 Extreme Heat Action Plan, a May 1 to October 31 heat season with cooling sites in libraries and parks, and a National Weather Service pilot that lowered the county's heat-advisory threshold from a heat index of 108°F to 105°F for two hours. Florida's HB 433 then barred counties from requiring heat protection for outdoor workers, and the county cut the officer post to help close a $400M budget gap. The heat season still runs; nobody holds the title.
Governing reported in 2026 that the plan's work included 1,700 air-conditioning units installed in public housing, hundreds of new shaded bus shelters and tens of thousands of trees planted, concentrated in low-income neighbourhoods. County-reported figures relayed by the press; no independent evaluation of the office or the plan was found.
🎓 Lesson
A measured number only bites if someone is allowed to act on it. Miami-Dade lowered the temperature at which an alert fires, then the state removed its power to attach any obligation to that alert, and then the budget removed the post that had argued for both.
Evidence📰 Media
Scale🗺️ Regional
FundingAdrienne Arsht-Rockefeller Foundation Resilience Center challenge grant, then county general fund and ARPA money
Sources
↗ Miami-Dade County — Chief Heat Officer (authority)Operator source for origin and title: 'In 2021, Miami-Dade County received a challenge grant offer from the Adrienne Arsht-Rockefeller Foundation Resilience Center to fast start an extreme heat initiative', leading to 'the world's first Chief Heat Officer (CHO)'; the CHO is 'responsible for improving coordination and accelerating existing heat protection efforts'. Caution: as of July 2026 this page still describes the role in the present tense, although the post has ended — do not read it as a status source.
↗ Miami-Dade County — Extreme Heat / Weather Ready (authority)The named season, verbatim: 'Heat Season protocol during the period of chronic high heat and humidity from May 1- Oct. 31'. Directs residents to 'visit a cooling site near you' but states no activation criteria — the cooling-site response is discretionary, not threshold-triggered. Also links county story maps on heat exposure and vulnerability, which did not render for review and are therefore not relied on here.
↗ NWS Miami — New Experimental Heat Advisory/Warning Criteria for Miami-Dade County (authority)The one place a measured value has an automatic consequence: from June 1 the Heat Advisory threshold for Miami-Dade fell from a heat index of 108°F or higher for at least 2 hours to 105°F or higher for at least 2 hours, in a pilot run with the county and justified by local health data; Miami-Dade was the only area in the country given this pilot. Direct fetch returned 404 during review; text confirmed via the search index and by the sibling page HeatCriteriaChangeBroward2024, which shows the criteria were later extended.
↗ Arsht-Rock / Climate Resilience Center — Miami's Extreme Heat Action Plan (funder)Dates the plan to December 2022 and gives its three objectives: cool neighbourhoods through green solutions such as increasing the tree canopy, increase access to efficient and affordable cooling in homes and emergency facilities, and increase outreach and education. Names a 30 percent tree-canopy goal and projects heat-index days at or above 100°F rising from close to 50 in 2023 to 91 by 2053. Funder source, not independent.
↗ KFF — Florida's heat-protection preemption law (independent policy research)The hard legal limit, verbatim: HB 433 'Prevents city and county governments from requiring that employers, including government contractors, provide heat protections for outdoor workers outside of those required under state or federal law', effective July 1, 2024. And the direct local consequence: 'County commissioners in Miami-Dade withdrew their pending proposal to provide heat protections standards to outdoor workers in the county.'
↗ Governing — Protecting Miami From Extreme Heat (press, 2026)Confirms the departure — 'Late last year, Gilbert left Miami-Dade to become chief heat ambassador with the Atlantic Council's Climate Resilience Center' — and carries the delivery figures: 'The county installed 1,700 air conditioning units in public housing', 'Tens of thousands of trees are being planted, particularly in low-income neighborhoods', 'Hundreds of new bus shelters give transit riders a place to get out of the sun'. Also reports research putting the county's true annual heat toll around 600 deaths, far above the recorded count — that figure is contested and is not used in this entry, because the same excess-mortality work produced both 34 and more than 600 depending on method.
↗ Miami-Dade County — Climate and Heat Health Task Force (authority)The governance layer around the post: the task force was to 'prioritize short-term actions, create a framework for prioritizing future actions and for monitoring progress, and recommend staffing', across four objectives — employer and public heat education, emergency-management and healthcare capacity, affordable efficient air-conditioning through weatherization, and heat in streetscape and parks design. Recommendations only; no mandatory instrument.
↗ CBS Miami — heat advisory, 18 June 2026 (press)Currency check: the season protocol still operates without an officer. 'With a heat advisory in effect for most of the day', 'heat index reaches 105 to 110 degrees', and the Miami-Dade Homeless Trust distributing water and directing unhoused people to cooling centres.
📎 Cite this project
1001 Smart Cities (2026). “Miami-Dade's Chief Heat Officer and Extreme Heat Action Plan” — Miami, United States. The Smart City Atlas. https://1001smartcities.org/projects/miami-chief-heat-officer/ (last verified 2026-07-26). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.
