Buy the 2015 Old Farmer's Almanac!
I was brought up to plantI was brought up to plant potatoes (New England) on or before St. Patrick's Day regardless of weather/frost- it worked there and has worked well for 30 yrs. in the Willamette Valley (Oregon-USA) harvest 1st crop early June, 2nd crop in late summer. Good luck!!

Shop Wind Bells in the Almanac General Store