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Day‐ahead forecasting for campus‐level load is important for better energy management, but especially difficult to be accurate, compared to large‐scale loads such as cities or regions. This is because irregular and unpredictable behavior of individual loads in small‐scale loads cannot be fully smoothed out and thus pose a negative impact on forecasting accuracy. This paper presents an online refinement strategy for day‐ahead forecasting using intraday data for a campus‐level load, focusing on self‐adapting correction of forecasting considering load pattern. First, according to the load pattern forecasted by Classification and Regression Trees (CART) one day ahead, the correction parameter group is assigned to the correction model. If the correction conditions are met, the forecasting results for the rest of the day will be updated. After all‐day load data is achieved, the actual load pattern can be identified and used to train CART model. To confirm the effectiveness of the proposed strategy, the model is evaluated by two datasets, a real‐life dataset of an industrial park in Shanghai China and a public dataset of an institute campus in Delhi, India. The results demonstrate that the proposed strategy can improve short‐term forecasting accuracy. [ABSTRACT FROM AUTHOR]