We do the same....well, except substitute "month" for "spring." Oh and in the summer substitute "3 weeks" for "month." What a difference from location to location.We clean it every spring.
Mark
Between your annual haul out, does your bottom receive regular cleanings/inspections from a diver? As BandB stated, amazing the difference between locations. Barnacles form quickly in the warm Florida waters.
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Here in the brackish waters near the mouth of the Napa River I'm finding I need ...zincs serviced every 3 months...so my diver comes every 3 months now ...
I get a full report after each quarterly inspection and bottom cleaning.
That seems excessive. Once every year is more than enough for me...
...just needed maintenance done by my diver.