It is important to note Hard Seltzer is very susceptible to oxidation and that will affect its shelf life.
Once you have made your Hard Seltzer -
- If the seltzer was transferred airless, and kegged, then it will last 6 to 8 months at optimum quality.
- If stored in PET or glass bottles in the fridge - 4 to 6 months
- If stored in PET or glass bottles at room temperature - 3 to 5 months