PNW Cold Front - Do I need to worry?

[McAlpine, Duncan G]

Should I bury my flats... with these temps...?  No snow in site....

I would prep your aroid beds..... and roses... for next weeks cold front.
I see a -13 F on the internet. As most of us know in the PNW... they could be wrong once again.
http://www.weather.com/weather/cities/us_wa_tacoma.html

Im getting my mulch ready and protecting my plants.

Duncan