Soil temperature sensors can differ in their sensitivity, accuracy, and response to changing soil temperatures. The objective of this study was to evaluate the relative response of three different soil temperature sensors under actual field conditions in the Yukon–Tanna lowlands of Alaska. The three sensors evaluated were the Campbell 107 thermistor sensor, the Stevens Water Hydra probe (potted thermistor), and the Measurement Research Corporation (MRC) temperature probe with fifteen thermistors. A Campbell CR10X 2M datalogger was used for data storage. Soil temperature was measured every 20 minutes at five soil depths (7, 24, 44, 65, and 85 cm) along a 50-cm transect over a 3-year period (from 2002 to 2005). The MRC probe showed much greater diurnal fluctuations in the near-surface soil temperature readings compared to the other two sensors. The hydra probe soil temperature readings show a significant time lag behind the Campbell 107 and the MRC readings. The behavior of each sensor under cold climate conditions is presented.