Fish are sensitive with temperature. Winter and Summer season are the 2 seasons in the year that effect us the most. We care about the health and safety of the fish during transit, and your shopping experience with us. It would be unethical, inhuman and waste of your money to ship a live fish order if we know your order will get delay, your fish might dead or stress. We have to make the decision to wait for a better weather to ship the order using UPS Next Day Air service and protect the fish. All orders contain live fish, we ship them with 1.5" thick insulated foam box during extreme weather in summers and winter season. We also included free heat packs during winter shipping. However, heat packs will stop produce heat if temperature is below 32F. We monitor the temperature across US daily to assure your love pet will arrive on time and safe, and make you happy. We would highly recommended our customers to avoid from order during extreme weather in your location.