Optimum barn size? —- if there is such a thing!

Don't ask me I'm always well behind 🤣

Lv 161
Barn 4250
Silo 4300

Miles behind most 😅

But enough to keep around 10 of each make-able item

And 100 ish of each crop (fruit trees/bushes I usually just harvest as needed)

How does one define "optimum"?

You could list all items available at your level and the amount you wouls like to store. Add them up for a minimum space.

My farm is 267 and lots would think my barn would be large, it not, but like all above I have adapted a playing style that makes it comfortable for me to play. I let my barn and silo upgrade what I call naturally thats within items I from my farming. Keep it balance with 10 items each. Sell the excess in my rss. Yes it takes a while to upgrade but I’m okay with that. The ting abut the game it allows everyone to play there own style.

Speaking of holding less of things, I use to keep 95 of each candle (why, I have no idea- it's the number that popped into my head at the time 😄, much like the different numbers of other items I maintain. There's no rhyme or reason whatsoever, lol). With all the new products, and me not upgrading my storages, I had to let go of most of them over a short period. I have about 15 now 😆.

I am at level 172 and I have 5800 barn and silo.
I only keep a maximum of 7 for end products, more for products that are also used as ingredients.
I never sell any dairy products.

I always have between 500-1000 barn space.

I've played that way for years, and it really works for me (although I fully understand that not everyone will want to use diamonds in that way).  It's a matter of personal choice of course.

I've taken this tactic further, and also "bank" land expansion.  The final piece for that costs 12 diamonds.

I'm now in the position where almost all of the final plots of "newest" land are ready to open when I get enough expansion permits.   I just need a few stakes and deeds to be complete.  It's then simply a matter of waiting for permits; I'll no longer need to store LEMs in my barn. 

"Banking" items is one way to manage your barn storage.

As you approach higher levels you need more and more items to expand your barn, silo and land.  

As an example, my level 252 farm needs the following: 

Barn - 213 of each (213 x 3 = 639)
Silo - 199 of each (199 x 3 = 597)
Land - varies by each plot but the current one I'm working on needs 77 of each (77 x 3 = 231)

My current barn capacity is 9700.  That's quite spacious, but keeping all expansion items in there would impact very seriously on the barn capacity and make farming much harder.  At my level I have all of the machines available, so I like to have a lot of space for products.

Instead of storing expansion materials until I have enough for a complete expansion, I bank each when I am one item below what is needed (once you go over, the ability to bank is lost).  For barn and silo expansions that costs 8 diamonds; for land expansion it is 12 diamonds.  The third item can be completed without using diamonds.

This helps me because items drop at different rates.  My farm generates planks, panels and mallets much quicker than other items - it's a wooden farm!

I'd stress that this is only one technique for tackling expansion.  There are other ways, of course,  but it suits me.

I hope this helps to clarify.  

I don't understand the 8 diamond strategy.

"With the tip above, play won't need to wait for 30 BEMs, they can do a partial upgrade. If I have a set of 5 bolt/5 plank/9 tape. I can choose to buy the last plank for 8 diamonds. Instantly, I'll get 9 space back. Barn is not yet upgraded, but I can use the space while waiting for other BEM."

How do you get nine spaces back instantly by spending 8 diamonds?
You buy one plank, then gain 9 spaces?
By buying one plank, you lose one space. Yes?

I can understand why you find this confusing.   Here are some screen shots which might help.  They we taken on one of my baby farms.  I don't usually bank items on this farm, but have done so to illustrate.  Here's the situation before:




As you can see, my barn is seriously overfilled, with 653/625. 

After tapping on the button to use 8 diamonds, this is what I get: 



The planks show a tick, and the barn storage has reduced by 24.

I hope this helps

My new question, how did you overfill your barn?

It is very helpful to illustrate the tip. Thank you for sharing, Cowslips.

(with very minor typo thath only a cat eye notice)

Yes you can.  Below is an image of the current state of my barn.  When I eventually have enough tapes I won't need to use diamonds though, so each full upgrade costs 16 diamonds.