Costco Mashed Potatoes - All Natural & Delicious!


Main St Bistro Mashed Potatoes at Costco

Costco sells 64 ounces or 4 pounds of Main St Bistro Mashed Potatoes for $7.49. The mashed potatoes can be found in the refrigerated deli area near other items such as the chicken sausagecarnitas, and the lobster ravioli.


Main St Bistro‘s Mashed Potatoes from Costco are all natural, made with fresh potatoes and whole milk, and have no artificial colors, flavors, or preservatives.

The mashed potatoes are sold as a 4 pound package with two individual 2 pound trays of mashed potatoes.

Main St. Bistro at Costco

The mashed potatoes aren’t the only food item that Main St Bistro sells at Costco; they also offer scalloped potatoes, which were a bit of a let down. 

I’m hoping the mashed potatoes can redeem the brand.

Mashed Potatoes Ingredient List


All-Natural Claims

Normally, I include the ingredient list near the end of the article with the nutritional information, but Main St Bistro has claimed their mashed potatoes have no artificial colors, flavors or preservatives, so of course, I had to check it out.


Simple Ingredient List

Their ingredient list as you can see is quite simple. The mashed potatoes have only 6 ingredients and they are:

  • Potatoes
  • Whole Milk
  • Butter
  • Salt
  • Black Pepper
  • Nisin – to Naturally preserve freshness
Fairly simple ingredient list that looks very similar to the ingredient list you would use if you were to make the mashed potatoes from scratch. Very nice!

Costco Cost Comparison & Price

How Much Do The Mashed Potatoes at Costco Cost?

Costco sells the 64 ounce twin pack of mashed potatoes for $7.49. Each tray of mashed potatoes therefore costs $3.75, and the per pound price for the mashed potatoes is going to be $1.87.


As expected this is going to be more costly than purchasing regular potatoes and making the potatoes yourself. In fact, it probably will be 2-3 more expensive than making homemade mashed potatoes from scratch.

Costco vs the Competition

Sam's Club

Sam’s Clubs sells their Member’s Mark 4 pounds of mashed potatoes for the same price of Costco’s at $7.49. The price is the same, but the ingredient list isn’t as clean.


Target sells a 24 ounce package of mashed potatoes for $4.29. This is a per pound price of $2.86 and is considerably more expensive than Costco’s price.

Costco Mashed Potatoes Taste Test

Easy to Cook

For these mashed potatoes, I opted to heat them in the microwave. It took about 7 minutes but it was a very simple and easy process. Much faster than making mashed potatoes from scratch!

Cooked Costco Mashed Potatoes

What I Ate It With

I had the opportunity to taste the mashed potatoes with my favorite meal of Crispy Chicken Thighs as well as with one of Costco’s heat & eat pot roast meals. 


For both options, the mashed potatoes complimented the protein perfectly and made the meal rather enjoyable.


Visually Pleasing

Mashed potatoes are one of those foods where you can really get a good idea of the quality just by looking at them, and I think these Costco mashed potatoes look pretty solid.  


They have a very nice pale cream color and there was definitely some texture in the potatoes. There were also plenty of visible specks of pepper throughout.

A Little Too Much

My wife didn’t care much for the mashed potatoes as she thought they were a little salty, but I didn’t notice any problems with that. 

The potatoes have an appropriate amount of salt but a very strong butter taste. 


If anything, the butter flavor was a little overwhelming. Not a deal breaker, but something that is noticeable.

I Enjoyed Them

Altogether, the mashed potatoes from Costco are solid. They aren’t as good as homemade mashed potatoes, but they are easily a step above instant potatoes. 

The mashed potatoes are enjoyable and a great addition to most meals.

How to Cook Costco Mashed Potatoes

How To Cook Main St. Bistro Mashed Potatoes?

Main St Bistro lists two heating methods for the mashed potatoes which are microwave and stove top. 

Normally, I avoid the microwave whenever possible, but their stovetop instructions do not seem to be intended to heat the entire 2 pound tray of mashed potatoes.



  • Cut a small slit in film to vent & microwave on high for 3 and a half minutes.
  • Carefully remove film and stir.
  • Replace loose film on tray and heat for an additional 2 to 2 and a half minutes.
  • Product and packaging will be hot. Let stand for 1 minute prior to serving.

Stove Top:

  • Small amounts can be heated on the range by placing mashed potatoes in a heavy saucepan over medium heat until hot. 
  • A small amount of milk or water may be added to mashed potatoes to aid in heating.
  • Stir Frequently.
It appears that the stove top instructions for these Costco mashed potatoes is meant to heat just a small portion at a time. 

Main St Bistro Mashed Potatoes Nutritional Information & Calories

How Many Calories in Costco Mashed Potatoes?

One serving of Costco mashed potatoes is going to be 1/2 cup or 124g (4.37 ounces). Each serving will have 170 calories made up from 9 grams of fat, 20 grams of carbs, and 3 grams of protein.


This is a standard mashed potato nutritional label. It’s not exactly healthy for you, but nothing seems out of place in regards to the nutritional information.

Servings Per Container?

The nutritional label for the Costco mashed potatoes does state there are about 15 servings per container. 

Container is a super interesting choice of words as I would assume that there are two individual containers in this twin pack of mashed potatoes.


In fact, Main St Bistro considers the container to be the entire package and not each individual tray. 

There is some ambiguity here which can be confusing for those who quickly glance at the nutritional label.

High Sodium

The big drawback to these mashed potatoes is going to be the high amount of sodium at 540 mg per serving or 23% of the daily recommended value. I will probably consume about 2 servings which means over 1000 mg of sodium and nearly 50% of the recommended daily value. 

This is an extremely high amount in general, and almost a deal breaker for a side dish. The main entree that accompanies the mashed potatoes will most likely have a solid amount of sodium as well and you can easily take way too much sodium for one meal.

Costco Mashed Potatoes Review

Product Name: Reser's Main St. Bistro Mashed Potatoes

Product Description:
Price: $7.49
Quantity: 4 Pounds
Location Within Costco: Refrigerated Deli Area
Price Per Pound: $1.87


Costco’s mashed potatoes are slightly better than average. They are easy to make and go great with a variety of foods. 

If the price was just a touch lower, I could see myself keeping some of these mashed potatoes in the fridge as a quick and easy dinner side dish. 

I’m happy with Main St Bistro’s mashed potatoes and they are much better than their scalloped potatoes.

  • Value - 7/10
  • Convenience - 8/10
  • Taste - 8/10
  • Nutrition - 8/10
  • CFDB Score - 6/10


  • Good flavor
  • Easy to cook
  • Appropriate portion size


  • Just a touch pricey
  • High sodium

Leave a Reply