The bean weevil, Acanthoscelides obtectus, is one of the most destructive insect pests of stored pulses globally. Cold treatment is a method used for controlling many insect species that are pests of stored-products. To understand if cold treatment can be used to control A. obtectus, we evaluated its cold tolerance at −5 °C and its supercooling point. Firstly, we measured the survival time of eggs, early instars, late instars, pupae, and adults at −5 °C using non-cold-acclimated insects, originally collected in Florida, USA. Secondly, we measured the survival time of late instars and adults at −5 °C using the strain from Florida and a strain from Ontario, Canada, and compared the effect of cold acclimation. To acclimate insects to cold, they were placed for 2 weeks at 15 °C followed by 2 weeks at 10 °C. The Florida strain had a slightly greater survival than the Ontario strain at −5 °C. Results show that at −5 °C, for non-cold-acclimated insects from the Florida strain, the most cold-sensitive stages were the eggs (LT50 of 2.3 d and LT95 of 5.3 d) and the pupae (LT50 of 1.6 d and LT95 of 6.0 d), whereas the late instars (LT50 of 4.0–4.8 d and LT95 of 8.2–8.7 d) were the most cold hardy stage. Cold acclimation increased insect survival time at −5 °C by several days. The egg was the stage with the lowest freezing point, with an average SCP of −27.7 °C. Therefore, all stages of A. obtectus would die instantaneously when exposed to this temperature. These results show that cold treatment can be used to control A. obtectus, particularly in Canada and other northernly regions where winter temperatures can be sustained below −5 °C for months and aeration fans can be used to blow cold ambient air into bins of stored pulses.