With much of the country experiencing wintry weather, April 1 might seem like a long way off. But U.S. companies that rely on skilled foreign workers should already be preparing for the first of April, which is also the first day that applications for H-1B visas can be filed for the coming fiscal year.

Employers have reason to be concerned about H-1Bs—the number of available visas per year is limited—and last year the fiscal year quota was exceeded in the first few days of filing. If companies miss the deadline this year, they will have to wait until April 1, 2015, to try again.