When Chia seeds, in their whole form, are kept in the refrigerator they will last for upwards of four years. Ground Chia Meal Kept In A Cool And Dry Location. When whole Chia seeds are ground into Chia meal and kept in a cool and dry location, they will last anywhere from one year to two years.hen Chia seeds are whole and are kept in a cool dry environment such as a pantry or garage, they will last anywhere from two years to four years, and do not require any additional preservative action to be taken. Whole Chia Seeds That Are Kept In The Refrigerator.