Depending on what you have for scions: Apple and pear should go into a freezer-rated ziploc with a moist napkin. You can graft pretty much from Mid-April and on or whenever your bark is peeling easily (if doing a bark graft).
If you took peach or apricot wood, same storage conditions apply, but you need to graft when the weather is in the 80's every day. which could mean summertime in these parts!
When I grafted plums, I would usually do it around mid-May as they appreciated the heat of the weather to help heal in.
How long can your scions last? Good question. If they have optimal sugars to live off of, they might be able to last another year in refrigeration. But if they are half way depleted of nutrients already, they won't go the distance.
I have held apple wood for 15 months or better in refrigeration and it was still good. But that wood was collected by me and put into cool storage immediately. Lots of other apple wood I receive will not last that long, due to nutrient reserves being used up by sub-optimal storage.
I have even had apple cultivars totally fail on me numerous times due to what I believe was too warm of storage (for too long) before it got to my refrigeration.
[quote="John S":1bhtnf05]Make sure your scions are in the shade. Cool area is best. Fridge is great if you don't cook or have a family. I am not in that camp.
John S
PDX OR[/quote:1bhtnf05]
Somehow I've gotten away with it this year (so far). In the past I've gotten in trouble for keeping my "sticks" in the fridge. I used to keep a mini fridge that I'd put them in. First in my bedroom, then the guest/grow light room, then garage, now no more (none of the moves were my idea 
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