Due　to　its　ability　to　block　airflow,　the　enclosed　courtyard　is　an　effective　means　of　enhancing　outdoor　thermal　comfort　in　cold　regions.　However,　the　impact　of　irregular　courtyard　boundaries,　particularly　those　with　tall　buildings,　on　wind　protection　within　the　courtyard　remains　insufficiently　studied.　This　paper　took　Reykjavik,　Iceland,　as　the　study　area　and　utilized　ENVI-met　software　to　conduct　numerical　simulations　of　courtyards　with　fifteen　different　configurations　under　multiple　wind　directions.　The　influence　of　irregular　courtyard　boundaries　on　the　pedestrian-level　wind　environment　(PLWE)　was　explored.　Overall,　due　to　the　unique　spatial　morphology　of　courtyards,　irregular　surrounding　buildings,　even　tall　ones,　are　unlikely　to　deteriorate　the　PLWE　within　the　courtyard.　The　results　also　indicated　that　the　spatial　morphology　of　the　boundary　was　a　critical　aspect　affecting　the　courtyard　PLWE.　Multiple　factors　collectively　influenced　the　PLWE,　including　the　angle　between　buildings　and　wind,　the　morphology　of　tall　buildings,　the　positional　relationship　between　tall　buildings　and　podiums,　the　relative　positions　of　tall　buildings,　and　the　degree　of　enclosure　of　the　courtyard.　Some　design　suggestions　were　given　based　on　the　research　outcomes.　This　study　provides　theoretical　references　for　wind　protection　design　in　courtyards　and　enriches　the　theory　of　climate-adaptive　urban　development　in　cold　areas.