The strong kiwi dollar, particularly against the British pound, also had a material impact.
FFW warned investors of a challenging period ahead in November, after the quakes caused significant damage to storage tanks at its Grove Mill winery in Marlborough, with some bulk wine lost.
The company, whose chairman is American billionaire Bill Foley, booked a $989,000 cost from the insurance excess, turning a first-half net profit into a reported loss, it said.
The winery will be repaired in time for the 2017 vintage.
"The last six months have been extremely challenging for the company. Besides the actual damage inflicted by the earthquake, getting the winery operational has been very distracting for our small team," said chief executive Mark Turnbull.
"The currency has compounded the problem of profitability of some markets and with a large vintage in 2016 many businesses are not in a position to increase pricing.
"We are determined to have a much stronger second six months and return the company to a growth path."
The NZAX-listed company's share price closed yesterday unchanged at $1.50.