Plant Zones and First Frosts

I am researching my plant zones and first and last frost dates today.  Did you know that in 2012 most of the United States underwent a change in plant zones?  That's right, most of us got moved 1 to 2 zones warmer.  Hmmm.... but global warming is a non-issue right? 
I am in zone 7a, but just barely.  You can check your zone here: http://planthardiness.ars.usda.gov/PHZMWeb/InteractiveMap.aspx
I then went and checked when I could plant here:
 http://www.almanac.com/gardening/planting-dates/NH/Dublin
Here are my dates:

Crop	Start Seeds Indoors	Moon-favorable Dates	Start Seeds in the Ground	Moon-favorable Dates
Beans			Apr 13-27	Apr 13-25
Beets			Mar 23-May 4	Mar 28-Apr 9
Broccoli	Feb 15-Mar 1	Feb 15-25	Mar 23-30	Mar 23-27
Brussels sprouts	Feb 15-Mar 1	Feb 15-25
Cabbage	Feb 15-Mar 1	Feb 15-25	Apr 6-20	Apr 10-20
Carrots			Mar 8-23	Mar 8- 9
Cauliflower	Feb 15-Mar 1	Feb 15-25	Apr 6-20	Apr 10-20
Celery	Feb 15-Mar 1	Feb 15-25
Corn			Apr 27-May 4
Cucumbers	Mar 16-30	Mar 16-27	Apr 20-27	Apr 20-25
Lettuce	Mar 1-16	Mar 11-16	Apr 6-27	Apr 10-25
Melons	Mar 16-30	Mar 16-27	Apr 27-May 4
Onion sets			Mar 16-23
Parsnips			Mar 23-Apr 13	Mar 28-Apr 9
Peas			Mar 1-16	Mar 11-16
Peppers	Feb 15-Mar 1	Feb 15-25
Potato tubers			Apr 13-27	Apr 26-27
Pumpkins	Mar 16-30	Mar 16-27	Apr 20-27	Apr 20-25
Radishes			Apr 6-20	Apr 6- 9
Spinach			Mar 1-16	Mar 11-16
Squash, summer	Mar 16-30	Mar 16-27	Apr 20-27	Apr 20-25
Squash, winter	Mar 16-30	Mar 16-27	Apr 20-27	Apr 20-25
Tomatoes	Feb 15-Mar 1	Feb 15-25

I don't think I can wait until March 23rd  to plant beets. I say that now, but I bet you those dates creep right up on me and I am scrambling to get things in on time. 
We are leaving our animals on our garden area over the winter in hopes that they will fertilize the land.  Maybe we won't have to add as much compost to the area. 
These are my favorite sites for seeds-
All time fav is : http://www.seedsavers.org/- they are trying to do it right, and draw from a huge number of members that have old time favorites.
http://www.johnnyseeds.com/  has a lot of information on the plants themselves.  I really appreciate the extra information.
http://www.territorialseed.com/   another great site for good quality seeds
You need to watch carefully to make sure you are not getting GMO seeds.  I am choosing not to grow corn this year, because I live in the middle  of corn fields and I do not want cross pollination between GMO seeds and mine. 

Another thing we are considering is how to keep pests from eating on our plants, and what kind of fertilizers we can choose that will benefit the plants but keep harmful chemicals from our plates.
The kids have suggested we get guinea keets to help keep the bugs at bay. I think this might be a good solution but they also make a bunch of noise all day long.  Think of them as the burglar alarm for your farm.  They let you know if anything is out of place! 
Do you have any great seed places you buy from each year?