That is so interesting that 80906 is now considered in zone 6A. I took a look at a zip code map for Colorado Springs and played with the USDA map site a bit. It says 80906, 80913, 80910, and 80911 are all zone 6A (these are the zones east of you), but then the zone directly south of you is still zone 5B.
Follow these directions to set up your own conditional formatting in a few simple steps. 1. Select the cells you want to format. 2. Click Conditional Formatting on the Ribbon. 3. Hover over Highlight Cells Rules in the drop-down menu. 4. Click on Text that Contains in the drop-down menu.5. Select the text you want formatted in the Text that Contains popup window.6.. Click Conditional Formatting on the Ribbon. 3. Hover over Highlight Cells Rules in the drop-down menu. 4. Click on Text that Contains in the drop-down menu.
3. Create a new formatting rule based on a formula, as explianed in How to create Excel conditional formatting rules with a formula. 4. In the  Format values where this formula is true box, enter the following WEEKDAY formula that will determine which cells are Saturdays and Sundays: 5.n the formula, A is the column with dates and D1 is the date format. If your table contains dates in 2 or more formats, then use the OR operator, e.g. =OR(cell(format,$A2)=D1,cell(format,$A2)=D2,cell(format,$A2)=D3). The screenshot below demonstrates the result of such conditional formatting rule for dates.