The early Paleocene was a time of dramatic ecological transformation following the Cretaceous–Paleogene (K–Pg) mass extinction. Although terrestrial recovery has been well-studied in the Western Interior of the United States, macrofloral records from early Paleocene Canada remain sparse. Here, we describe a diverse early Paleocene fossil plant assemblage from the Ardley Coal Zone of the Scollard Formation at the Highvale Coal Mine in Alberta. The flora includes 27 leaf, fruit, and seed taxa and is composed of ferns, conifers, and broadleaf angiosperms preserved in floodplain and swamp deposits lying about 14 m above the K–Pg boundary. We present new taxonomic descriptions alongside quantitative palaeoclimate reconstructions using leaf physiognomic and Nearest Living Relative methods. These estimates, synthesized via an ensemble approach, indicate that Highvale supported a warm-temperate (mean annual temperature of 9.6°C), humid forest (relative humidity at 76.8%) with moderate seasonality (driest month precipitation at 4 cm) and moderate net primary productivity (701 gC m−² yr−¹). These results are compared to those from the broadly coeval Genesee and Ravenscrag fossil floras, which reflect a latitudinal climate gradient and localized environmental variation during the early Paleocene in western Canada.