Does anyone know of a national frost forecast map?

(Zone 7a)

Thanks in advance. Considering how much crazier the weather has been around here in recent years, I'm aware of the limitations of such a thing, but - still - I went pretty crazy myself with unusual species & Japanese morning glories this year. I don't see how I could harvest all the pods on whatever random day before night of probable frost. So, I'm thinking of starting 10 days before a forecast frost date of cutting some stems with green pods to ripen in jars of water, rather than wait till last minute to do it all at once. The process of harvest will be slowed by some vines being tangled with neighbors and keeping pods related to coded vines so I can maintain true cultivars.

For many years, frost came regularly between Oct 18 & Oct 22. Since then, it's varied from earlier in October to quite a range in November.

(Zone 7a)

Found it over in Garden Talk - http://davesgarden.com/community/forums/t/775758/

But still, would like to see this in map form - anyone know?

Rocky Mount, VA(Zone 7a)

USDA Map site: http://www.usna.usda.gov/Hardzone/ushzmap.html

Rocky Mount, VA(Zone 7a)

Did that help - I'm deleting older threads this morning, if it did not help I will keep looking.

Rancho Cordova, CA(Zone 9a)

all of these spots say Sacramento california should already have frost, we haven't ??

Average First and Last Frost Dates http://www.victoryseeds.com/frost/
Frost Chart for United States http://www.almanac.com/garden/frostus.php
http://www.gardenpursuits.com/frostdates/frostdates.asp

http://usagardener.com/breaking_ground/frost_dates_usa.php

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