The e-commerce company said it is expecting to report a net loss between -$12.5 million and -$7.5 million for the third quarter.
Analysts polled by Thomson Reuters are expecting third quarter net earnings of 1 cent per share.
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Zulily is predicting its third quarter 2014 revenue will be between $275 million and $287.5 million, while analysts are expecting revenue of $283.29 million.
Despite the company's low guidance, Zulily reported an increase in non-GAAP net income to $11.4 million, or 9 cents per share for the 2014 second quarter, compared to $5.7 million, or 5 cents per share for the 2013 second quarter.
Zulily's net sales grew 97% to $285 million for the most recent quarter, over the year ago period.