Many gardeners mistakenly treat the frost date as a fixed deadline, leaving their plants vulnerable to early frosts. Instead, prepare for frost by having protective materials like frost cloth ready by the 10% probability date. Another common mistake is relying on thermometers that read above freezing; frost can form even when temperatures are between 33 and 36 degrees Fahrenheit. Additionally, avoid using plastic sheeting to cover plants, as it can cause more harm than good. Opt for fabric covers like old bedsheets or frost cloth, which provide better insulation.