Copied from: https://www.colorado.gov/pacific/cdle/unemployment-frequently-asked-questions
A: You are considered a seasonal worker if you work only during a certain period of time or season (e.g., ski instructors and income-tax preparers). You are not eligible for unemployment benefits if you are out of work just because the season ended. However, if you have lost your job through no fault of your own during the season, you may be eligible to receive unemployment payments. The employer is required both to post a notice and to notify you that you are hired for a seasonal job.
If you work for a seasonal employer outside the normal season, you are not considered a seasonal worker, and may be eligible for unemployment benefits if you lose your job through no fault of your own.
You work for a ski resort. The resort’s season is from November 15 through April 15.
Example 1: You begin work on November 15 and end work on April 15. You are not eligible for unemployment benefits from this job.
Example 2: Suppose you are laid off on January 5 because there is no snow. You may be eligible for unemployment benefits from January 5 until April 15 because you are out of work during the season.
Example 3: You continue to work until May 5 because there is more snow than expected. You may no longer be considered a seasonal worker because you worked for that employer outside the season. If you lose your job, you may be eligible for benefit payments.