not sure about length of time pollen is good when frozed...ive froze it be and used it and some was good but then seems later on when tryna use the same again it wasnt any good..i used to have a lot of diff strains pollen but i tossed em when i found they wasnt keepin very long..i had em in double or trippled ziplocks in a sealed jar too...so now i just use it up right away