Washingtoniana filifera vs Sabal mexicana in cold hardiness

[TonyDFW]

People often ask, which is more cold hardy? W. Filifera or S. Mexicana. Last winter in Dallas we had a test for cold endurance. 3F with 10 consecutive days below freezing.  I wouldn’t make a sweeping generalization, but more s. Mexicanas survived than did the washingtonianas. Large adult specimens of both species were wiped out. There were a few survivors of both species. 
In the following images you will see the one large palm specimen that survived ( with its foliage intact too) among a group of palms. An adult and nearby juvenile Sabal mexicana survived among 5 filifera. All grown on site from seedlings.  

[DreaminAboutPalms]

I think if you were to compare Sabal Mexicana hardiness to Washingtonia Filifera hardiness when the Filifera was in the desert it could compete. Sabal Mexicana is best for Texas though 

[DreaminAboutPalms]

Also we got lucky this past year; most of Texas was in a huge drought leading up to you know what otherwise I don’t think we’d be seeing as many Filifera recoveries  

[amh]

21 minutes ago, DreaminAboutPalms said:

Also we got lucky this past year; most of Texas was in a huge drought leading up to you know what otherwise I don’t think we’d be seeing as many Filifera recoveries  

Unfortunately the next bad cold spell looks to be wet.