Answer: According to your zip code, you are gardening in USDA winter hardiness zone 6. Unfortunately, Texas sage or Leucophyllum frutescens is only considered winter hardy into zone 7. "Silverado"(aka "Bertstar Dwarf") is a named variety of L. Frustescens and would have the same hardiness range.
If you garden in a very sheltered location with protection from winter wind, and if the plants were planted in a very well drained spot, and if they were heavily mulched in late fall, and/or if temperatures stayed above 10 F this past winter, they may have survived but defoliated. If so, they will take a while to begin to grow, and you may also have to trim them back to remove winter-killed stems. But, I would not really expect them to have survived.
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