Maize yields in the southwestern US can be significantly increased by planting at the right time. By using a computer model to simulate different sowing dates, researchers found that earlier planting in cooler mountainous areas can lead to higher yields by extending the growing season. In warmer regions, yields are more affected by temperature variations during planting and late growth stages. This study shows that adjusting sowing dates based on local climate conditions can greatly improve maize production in the region.