**Clear skies and light winds following a cold frontal passage on October 15 are the main drivers of overnight radiational cooling, positioning the expected low temperature for Denver on October 16 near the freezing mark.** National Weather Service and other forecasts indicate mostly clear conditions with highs in the upper 50s to low 60s°F and overnight lows generally in the low-to-mid 30s°F (around 31–36°F), consistent with post-frontal dry air and Denver’s high elevation (~5,280 ft) enabling efficient heat loss. A Freeze Watch highlights the potential for readings at or below 32°F. Model consensus supports this range, though minor variations in wind speed, cloud cover timing, or urban heat island effects introduce uncertainty between the low-30s and mid-30s bins. The closely matched market-implied odds for 27°F or below versus 46°F or higher reflect trader assessment of these variables and historical October variability, with official observations from Denver stations determining resolution. Updated NWS guidance and model runs through the overnight period will provide the key signals.