Purified gDNA samples can be stored at 4°C. However, for long term storage, we recommend storing them at -20°C. The Monarch^® Spin gDNA Extraction Kit (10 mM Tris-HCl, pH 9.0, 0.1 mM EDTA) that is supplied with the Monarch Genomic DNA Purification Kit provides extra safety for long term storage of gDNA samples.