Easy answer: Almost anywhere you can find some kind of fossil within 20 minutes. If not move on to a different locality. Some areas are better than others.
West Fort Worth has abundant ammonites, heart-shaped sea urchins and other invertebrates. The Arlington, and Grapevine/Colleyville area is pretty sparse for fossils. However, there have been some occurrences of dinosaur, crocodile fossils and ammonites.
The Grand Prairie and Irving areas are good for collecting shark and fish teeth, vertebrae, and ammonites. The Eagle Ford Shale Formation produces ammonites with the original "mother of pearl." Any open bit of soil is a potential site.
Try creeks and the slopes of hills were there is no vegetation for potential collecting sites. Late fall, winter and early spring are a good times to collect in N. Texas.
The snakes are (should be) in hiding and the 100 degree heat is only a bad memory. Depending on the severity of the winter, mosquitoes are often in full force. So even Texas is not ... more.
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