Which Shrimp to Buy (Frozen vs Fresh, Size & More)

Walk into any grocery store and you'll find a wall of shrimp options - fresh, frozen, shell-on, peeled, deveined, wild-caught, farmed - and almost no guidance on which one actually matters for pan searing. Here's what does.

Buying the right shrimp matters just as much as how you cook it. Frozen vs "fresh," size numbers, shell‑on vs peeled, how it smells, and how you thaw it all show up in the pan later. Here's how I choose shrimp at the store so I get juicy, sweet shrimp every time

Frozen beats "fresh" every time

Almost all shrimp sold as "fresh" at a fish counter was previously frozen and thawed on-site, sometimes days ago. You have zero control over how long it's been sitting. Buying a bag of individually quick-frozen (IQF) shrimp and thawing it yourself means you control the timeline - and you'll consistently get better texture in everything from a quick weeknight sear to a more involved dish like Cajun Stuffed Shrimp.

For a deeper look at thawing, prep, and cooking, I walk through the whole process in my Complete Shrimp Guide.

Size matters more than you think

For stovetop pan searing, you want large (31/35 count) to jumbo (16/20 count) shrimp. The count number refers to how many shrimp are in a pound - so a lower number means bigger shrimp. Larger shrimp give you a longer window between perfectly seared and overcooked rubber. Small shrimp (51/60 count) go from raw to overdone in under 60 seconds on a hot skillet; one moment of distraction and they're shot.

If you want to see how size plays out in a different context, the Lemon and Herb Shrimp Orzo uses large shrimp for exactly this reason - they hold up beautifully even after being folded into a saucy pasta.

For high‑heat methods like grilling, those same medium‑large sizes are ideal; I explain why in my How to Grill Shrimp tutorial.

Shell-on or peeled?

Shell-on shrimp have marginally better flavor because the shell acts as insulation and concentrates juices during cooking. But for a quick stovetop sear where you want a clean golden crust and easy eating, peeled and deveined is the right call. You lose a tiny amount of flavor in exchange for dramatically better browning on the exposed flesh - a trade worth making every time.

If you're unsure about prepping shell‑on shrimp, I break down peeling and deveining step‑by‑step in my Shrimp Guide and use that same method in How to Cook Shrimp on the Stove.

Trust your nose

One more thing worth knowing before you buy: trust your nose. Fresh shrimp smells clean, briny, and faintly like the ocean. If it smells strongly fishy, sour, or like ammonia - or feels slimy rather than firm and slightly glossy - don't cook it. Raw shrimp stored in the fridge should be used within one to two days of purchase; beyond that, texture and flavor both degrade noticeably even if it technically hasn't spoiled.

How to Thaw Frozen Shrimp

• Thaw it just before you need it. I never let it thaw overnight in the fridge because it will accumulate too much histamine that way. Histamine is the stuff that makes you sneeze and have watery eyes, it can also cause mild to severe digestive issues.
• What I usually do is take the shrimp out of its package, put it in a bowl or colander in the sink, and run cold water over them for about 5 minutes.
• Toss the shrimp occasionally to make sure they are all exposed to the cold water. You will know that the shrimp is thawed and ready when they are no longer frozen solid but soft, easily bendable, and slightly translucent.

Once you know which shrimp to buy-and how to thaw and prep it-you're ready to cook. For stovetop technique, start with How to Cook Shrimp on the Stove. If you're firing up the grill, go to How to Grill Shrimp. And if you want lighter dinners that put all of this to work, my Healthy Shrimp Recipes roundup has plenty of low‑carb, high‑protein ideas.