Partially fill a water canner with hot water. Place clean canning jars in the water, cover, and bring to a boil on high heat**.
Meanwhile, about 5 minutes before processing, place lids in boiling water and follow manufacturers instructions. (I usually use a separate smaller pot for this.)
Cut a thin slice from the ends of the cucumbers. Quarter larger cucumbers, and cut medium cucumbers in half.
In a medium pot on medium high heat, combine vinegar, water, and salt and bring to a boil.
Remove hot jars from canner. Place 1 head dill and 1 clove garlic in the bottom of each jar. Pack with cucumbers.
Pour boiling vinegar mixture over the cucumbers, leaving ½ inch of headspace below the rim. Wipe rim clean if needed. Center lid on jar and screw band on fingertip tight.
Place jars in canner, ensuring they are covered by about 1 inch (add more hot water if needed). Cover and return water to a boil. Once water is boiling, process for 10 minutes for pint jars and 15 minutes for quart jars***.
Remove jars from canner and cool for 24 hours. After 24 hours, confirm that the lid is curved downwards and vacuum sealed****. Remove screw bands and dry them. Screw back loosely on the jar (or store separately). Store for 3 weeks before enjoying. Serve chilled and refrigerate after opening.
Notes
Note: garlic may turn green or blue. This is a reaction of the vinegar and the pigment in the garlic. Makes 4x pint jars or 2x quart jars*For best results, use Diamond kosher salt, or a brand that does not contain anti-caking agents. These additions may make the pickles cloudy (but they are still edible). **Due to longer processing time, jars do not need to be sterilized, but do need to be hot. ***High altitudes will need to add processing time: 1,000-3,000 feet add 5 minutes 3,000-6,000 feet add 10 minutes 6,000-8,000 feet add 15 minutes 8,000-10,000 feet add 20 minutes ****If any jars did not vacuum seal, refrigerate and use within 3 weeks.