Pre-emergent Weed Control of Summer Annual Weeds

[tvodden]

I live in Chico CA, , we tend to get what I call a false spring in early to mid feburary in witch day time temps can reach 70 to 80 degrees before the freeze comes back in a week or two. Because of this I am thinking of puting down a pre emergent this week.

(It has been in the 50s and high 60s this week) is this too early?

I don't want to waste money on a product that will wash out before it is needed. ( my lawn slopes toward the street)

Thanks in advance for any help