Estimation of lake ice properties (e.g., thickness, gas content, liquid water content) is crucial to understanding ice growth processes and methane emissions. Previous work quantified northern lake ice properties locally based on direct drilling and visual assessment of gas bubbles trapped in ice. However, there is still a lack of quantitative methods to estimate lake ice properties in between field (<1 m2) and remote sensing (>100 m2) scales. We suggest that this gap can be filled using non-invasive ground penetrating radar (GPR) measurements. Here we present an investigation into the variability of ice thickness and radar wave velocity of nine thermokarst lakes on the Arctic Coastal Plain of Alaska using GPR. The field measurements were conducted during the spring (April 2019) when seasonal ice covers the lakes. Our results suggest a correlation between lake ice thickness and radar wave velocities. Compared to the radar velocity for pure ice (~0.168 m ns-1), we observed 58 points (~43%) with faster velocities (a proxy for gas content), and 73 points (~54%) with slower velocities (a proxy for liquid water content). Pilot results of borehole nuclear magnetic resonance show evidence of liquid water content (≤0.016 m3m-3) in Arctic lake ice. Ice core analysis shows that tubular bubbles (non-ebullitive) volumetric content is low (≤0.012 m3m-3). This research provides new insights into the complexity of Arctic lake ice properties that can help to calibrate future efforts to conduct satellite remote sensing measurements on a regional scale and improve climate change projections.