6 Months Swapping Sourdough Flours: What Actually Works

Bread flour, AP, whole wheat, rye, einkorn, spelt — I rotated each one through the same starter for six months. Three were keepers. The rest had real downsides nobody mentions.

The setup: same starter (a four-year-old culture), same hydration (76%), same fermentation schedule, same Le Creuset Dutch oven, same temperature controller. Only the flour changed. I baked 24 loaves over 26 weeks, scoring each on crumb structure, oven spring, crust, and flavor.

Three flours that earned a permanent spot

King Arthur bread flour was the boring answer that wouldn't go away. Predictable rise, open crumb, easy shaping. If you're feeding a starter for the first time and want a baseline that just works, this is it — no surprises, no wasted weekend.

Hayden Mills white whole wheat changed how my loaves tasted. The first one came out grassy and dense — white whole wheat needs more water than the bag suggests. After bumping hydration to 82%, I got loaves with the open crumb of bread flour and the nutty depth you actually want from whole grain. Worth ordering a 25-lb bag if you have a chest freezer.

Janie's Mill medium rye in a 20% blend with 80% bread flour was the sleeper hit. Rye on its own is a mess for sourdough — sticky, slow, unpredictable — but at 20% you get a faintly sour, faintly caramel note that elevates the loaf without fighting the structure.

Flours I'd actively skip

Spelt at 100% was a disaster — the dough collapsed mid-bake every single time. Einkorn ($8/lb at Whole Foods) was the most expensive and most disappointing: beautiful crumb on the bench, gummy interior after bake. Some bakers swear by it; I think they're using a different fermentation schedule than mine.

Gear that moved the needle

A KitchenAid stand mixer with dough hook saves 15 minutes of hand mixing per loaf — a meaningful time saving when you're baking twice a week. The Le Creuset 5.5-qt Dutch oven gives the steam environment that produces proper crust and oven spring — no aluminum pan comes close. And a digital instant-read thermometer tells you when your boule is actually done at 205°F internal, not when you guess it's done at 45 minutes.

If you only do one thing differently after reading this: weigh your flour with a digital kitchen scale. Volume measurements with whole-grain flours can be off by 20%, which is the difference between a great loaf and a brick. The scale is a $25 fix for a problem that ruins otherwise good bakes.