Processing times and altitude up here at 4,600 feet
Before we get to the actual number you need, I'll be straight with you: I always have to look this up. Every single time. I know we're at about 4,600 feet in American Fork and I know that means we add time to whatever the recipe says, but the exact adjustment doesn't live in my head, it lives on a chart. So we'll look at the chart together, and then you're going to keep a copy somewhere you'll actually see it, because you will need it more than once.
Here's the reason it matters. Water boils at a lower temperature the higher up you are. At sea level it's 212 degrees. Up here it's a few degrees cooler. Doesn't sound like much, but that boiling water is the entire thing standing between you and unsafe jars, and if it's not as hot it needs more time to do the same job. So the recipe on the pectin box that says "process 10 minutes" was written by someone at sea level, or close to it, and it doesn't know you live at the base of the mountain.
The standard adjustment most charts use looks like this:
- 1,001 to 3,000 feet: add 5 minutes
- 3,001 to 6,000 feet: add 10 minutes
- 6,001 to 8,000 feet: add 15 minutes
- 8,001 to 10,000 feet: add 20 minutes
American Fork sits right around 4,600 feet, which puts us in the 3,001 to 6,000 range. Add 10 minutes to whatever your recipe says. If you're up the canyon, or you've moved somewhere higher, check again, don't assume it's the same as down here in the valley.
So if your jam recipe says process 10 minutes, up here you're doing 20. If your pickle recipe from the last module said 10, same thing, 20 minutes at a full rolling boil once you're loaded in and timing starts. This isn't the same as cooking the jam longer on the stove to set it, we covered that already. This is purely the water bath step, after it's jarred and lidded and going into the canner.
I'll give you the opinion here because it fits. People get so scared of processing that they oversterilize and overprocess everything, like more boiling can't possibly hurt. It can, texture-wise, your pickles get softer the longer they sit in that boil. But undertiming because you didn't account for altitude, that's the real risk, that's the one that actually matters for safety. Get the number right, hit it, don't pad it "just in case." Just in case isn't a method, it's guessing, and I'd rather you know than guess.
Practically, here's how to handle it in your own kitchen. Find the processing time on your recipe. Add 10 minutes, because you're at 4,600 feet. Write that final number on a sticky note and put it on the canner lid, not in your head, because your head is busy watching the jars and you'll forget mid-boil, everyone does. Start your timer only once the water's at a full rolling boil with the jars loaded, not from when you turned the burner on.
And keep the water level right, at least an inch or two over the jar tops. If it drops during the boil, especially with the dry air we get here evaporating things faster than you'd think, add more boiling water from a kettle, don't dump cold water straight in against hot glass. That's how jars crack.
This is a good spot for the year I ran out of jars at ten at night. Deep in peach season, the good roadside peaches, the kind that don't wait around for you to get your life together, and I'd underestimated how many jars a "few boxes of peaches" turns into. Mid-batch, jars gone. Drove to two stores that night. Came home with the wrong lids, the ones that don't fit my rings, and had to laugh about it and regroup in the morning. Now I buy lids in March like I'm stocking a bunker. Brett doesn't say anything about it anymore, he's learned.
The lesson in that isn't really about lids, it's about having your plan solid before you start, jars counted, time added up front including the altitude bump, so you're not doing math at ten at night over a hot canner. Do the math now, while you're calm and the water's not even on.
One more thing. If your altitude is different from mine, the chart still applies, just find your row. And if you genuinely don't know your elevation, your county extension office can tell you, or your phone probably can too.
Before next time: find your recipe's base processing time, add the 10 minutes for our elevation, and write the total somewhere you'll actually look during the boil, not somewhere you meant to write it down.