The reason I think Zestimates, at least for my property, are not accurate is because last February my property had a Zestimate of $325,000. The appraisal for my refinance at the end of March 2020 was $300,000. The current Zestimate for my property is $392,000 which would be over a 30% increase in less than one year from the $300,000 appraised value.