The Scottsdale Show has been cancelled for 2021, after organisers deemed it "unworkable" due to the restrictions on public gatherings.
It comes less than a week after the Royal Launceston Show was cancelled for the same reason, as was the Brighton Show.
State government grants had recently been offered to agricultural shows, with Hobart Show announcing last week it would go ahead.
But despite that support, both Launceston and Scottsdale shows referenced the lack of a timeline for COVID restrictions ending as a reason for the cancellations.
Scottsdale Show president Trevor Hall said it was a "heartbreaking decision" to cancel the November event, which would have been the 117th.
"While in Tasmania we are very fortunate to be living relatively normally, with the current COVID restrictions related to gatherings and the regulations imposed upon the organisers of the gatherings, it was deemed simply unworkable," he said.
"Coupled with the fact that there is no certainty around when these restrictions may lift or in fact tighten, running the event would be financially unviable and at best, extremely risky.
"We pride ourselves on delivering a high standard event and believe that with all this in mind we would not be able to provide our competitors, exhibitors, or patrons with the enjoyable experience they so rightly deserve.
"The committee regrets any inconveniences caused and will now concentrate on planning our 2022 show and hope that by then our lives will have returned to normal once again."
His comments mirrored those of Launceston show president Dale Beams when he announced its cancellation last week.
"Due to COVID restrictions currently in place for public gatherings, along with the uncertainty of any timeline around lifting restrictions, it makes it unworkable to hold an event such as the Royal Launceston Show this year," Mr Beams said.
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