Hi, 

The soil temperature map is showing that the approximate temperature in central MD is around 60 degrees. Generally we say October is the time frame to plant daffodil bulbs, and we are almost there so the bulbs you planted should be fine. Most daffodil varieties are fairly resilient. Different sources have listed the 'Thalia' variety to be planted when soil temperatures are about 55 degrees, and with weather trending cooler, they should be ok. Even if some top growth does come up and then freeze, it shouldn't affect the bulb. https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=251191&isprofile=0 Missouri Botanical Garden state early to mid fall and they are roughly the same growing zone as Maryland (perhaps a tad cooler depending on location), so their guidance of early to mid fall sounds about right for us too.

In takes a few years for the bulbs to get going and multiple anyways, so we would recommend you just plant them when you have them, and they can start developing roots. As along as they are the appropriate depth, they should be fine! 

If you have other concerns or questions, feel free to reach out. 

Emily