IntroductionAir temperatures in Alaska are increasing at twice the rate of the contiguous United States. Soil temperatures have been shown to be increasing across various landscapes but have overall received less attention. No comprehensive studies have been conducted in Alaska looking at soil temperature trends on a broad scale.MethodsIn this paper we synthesized soil and air temperature data from 43 weather stations across Alaska spanning a 27-year period (1997-2023). Stations were divided into three regions based on permafrost extent (continuous, discontinuous, and no permafrost). Soil temperature trends were calculated at 5, 20, and 50 cm depth in all three permafrost regions, and additionally at 70, 95, and 120 cm depth for the continuous permafrost region only.ResultsAnnual average soil temperatures increased significantly across all regions with the fastest warming rates occurring at the highest latitudes. Whole profile warming averaged 0.64, 0.37, and 0.35°C dec-1 in the continuous, discontinuous, and no permafrost regions, respectively. Warming was not slowed by increasing soil depth. Air temperatures warmed faster than soil (p 0.1). Seasonally, soils in the continuous and discontinuous regions warmed fastest in the winter months, whereas in the no permafrost region soils warmed fastest in the summer months.DiscussionThe relationship between air and soil temperatures was significantly impacted by the presence of snow in the winter months. The correlation between air and soil temperatures was weakened by the presence of snow in each permafrost region, particularly those with deeper snowpacks (discontinuous and no permafrost).