The Old Castletown Road will shut near the Nunnery next month.
The route will be shut from 9.30am until 3.30pm on Friday, May 24.
It's as workers fell large dead Ash trees near the main gates of the facility.
Ramsey company Manx Roots, which is doing the work, says it needs to close the road because the work couldn't be done safely with traffic controls.
Island bodybuilder invited to represent Great Britain
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Manx landmarks to light up in honour of Lucas 'Looky' Martin
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Last chance to sign up for safeguarding conference
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£768,000 spent on Castle Rushen since 2010
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Manx TT rider discharged from hospital after crash
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Kids can already enter designs for mayor's Christmas cards
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Douglas Councillor resigns with immediate effect
A Douglas City councillor has stepped down with immediate effect.
Customers urged to check prices at the till
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