No, Nola Bars are shelf stable at room temperature. If they experience excessive temperatures during shipping, please stick them in the fridge for a while to help restore their normal texture.
Nola Bars may also stiffen over time. But 5-15 seconds in the microwave will soften them to their original texture. This slight hardening happens because we only use completely natural ingredients. We'd rather suggest you stick them in the microwave than add a whole bunch of artificial junk ingredients.