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How to Dry Tomatoes at Home: Oven vs Dehydrator

How to Dry Tomatoes at Home: Oven vs Dehydrator
Home » Preserving Food » DIY sun-dried tomatoes

What is the best way to preserve home grown tomatoes….oven-dried or with a dehydrator?  Should you use roma tomatoes, slicers or plum types of tomatoes for dehydrating? Here are some detailed tips of how to dry tomatoes at home so that you can preserve the delicious flavor of home grown tomatoes all Winter!

Principe Borghese tomatoes drying in the sun
Principe Borghese tomatoes drying in the sun

Best Time to Harvest Homegrown Tomatoes for Dehydrating?

Every year is a bit different and every climate zone is a bit different so you want to time your harvest around an impending frost and a shorter day length. This means paying attention to your local weather reports for frost predictions.

Impending frost is the most important variable, but it is also important to understand the relationship of the growth cycle to daylength.

Harvesting after a frost equals mushy tomatoes. Harvesting with short daylengths means they might not develop their sugars in the same way (i.e., it’s going to take longer).

Once harvested, the tomatoes may develop a deeper color while resting on your counter, but they won’t develop their sugars any further, so just be aware that they may turn red but you won’t necessarily get that great homegrown flavor.

The visual appeal of a bright red dried tomato however is much more appealing than pale pink or green tomatoes. We do eat with our eyes also, so it is worth allowing the late-harvested tomatoes to color up before drying.

How to Dry Tomatoes at Home

So, on to process.  I have done oven-drying, sun-drying and drying with the food dehydrator and for me, the food dehydrator wins hands down. 

Principe Borghese tomatoes drying in a dehydrator
Principe Borghese tomatoes drying in a dehydrator

Oven drying works, but the tomatoes come out quite dark in color and the texture is more difficult to manage.  They will often become way too brittle. 

Here is a quick rundown on process tips for both oven-drying and using the dehydrator:


  1. How to Cut and Size Tomatoes for Drying

    Adapt your slice and dice to the type of tomato you have.  If it is a plum tomato or a cherry, just cut in half and place them sliced side down on your dehydrator tray or your cookie sheet if oven drying.  If it is a beefsteak or roma tomato, slice the tomato thickly and then cut slices in half (these will shrivel to bite-size. 

  2. Should You Remove the Seeds?

    Sometimes seeds can add a richer dimension to a dish, especially if you are blending tomatoes in a sauce or soup. If you are adding tomatoes to a salad, salsa or casserole it is best to remove the seed or your dish may turn out gooey or watery. For dehydrating, I leave the seeds in for the richer umami flavor.

  3. Adding Oil and/or Salt Before Drying

    Many people will oil and salt their tomatoes before drying.  I don’t do either because I sell them at market and people have different tastes and needs when it comes to oil and salt.  For home use, I will add the salt to the dish rather than the tomatoes.

  4. Temperature and Air Circulation

    Dried tomatoes need not only the heat, but also good air circulation.  If drying in an oven, turn the heat on to about 200 degrees and crack open the oven door.  A convection oven works best due to the circulation.  If drying in a food dehydrator, I turn the heat on to 135 degrees for the first 5-10 hours and then decrease it when they have dried to a point where they are almost ready but still a little soft to the touch.Principe Borghese tomatoes drying in a dehydrator

  5. Length of Time in Oven or Dehydrator

    This is hugely variable.  It is going to depend on the type of tomatoes you use and the type of heat/air source you are using.  The only thing for sure is that it takes quite a long time.  I frequently leave my dehydrator on overnight and then finish them off at a lower heat for a few hours in the morning.  You just have to keep checking them the first time you do it to see how your heat source works.  Check every hour or two by feeling them.  Two key factors:  they should end up pliable-not brittle, and they should not have any moistness to the flesh (or they will mold later).

  6. Remove in Stages from Tray or Pan

    The tomatoes are all different (just like us) in terms of ripeness, how you cut them, where they lay on the cookie sheet, etc.  You need to remove the ones that are done (to a countertop to cool) and leave the others to finish.

  7. How to Store

    I store mine in breathable plastic bags.  I know some people will store them in oil in the refrigerator, but my refrigerator is much too full of leftovers, etc. for that and the oil will go rancid if you leave it out.  If you store them in oil, be aware that the oil will get murky in the fridge and them clear up when you get it back to room temp.Freezing tomatoes: a freezer bag of smoked Roma tomatoes

  8. How to Use Sun-Dried Tomatoes in Winter

    Dried tomatoes can be used in so many delicious ways (I’m sure there are many blogs about this!).  Rehydrate them in warm water, toss them in a tomato sauce to slowly rehydrate, cut them up dried and toss in a salad, or munch on them as-is for a great snack. Piece of skillet pizza with dried tomatoes and a beer crust

  9. Which type of Tomatoes Dry Best?

    Choose the meatiest tomatoes you can find or you will get a lot of dried tomato skin and they will be much more brittle.  The very best tomato for drying is the Principe Borghese heirloom.  It is a plum-size tomato with a lot of meaty flesh, a lot of bold taste, and just the right size for drying.  Romas and some globe tomatoes are quite meaty and will dry well, but they just don’t have as much taste as the Principe.  Beefsteak tomatoes are usually pretty juicy and are difficult (not impossible) to dry. Four varieties of red heirloom tomatoes

Ideas for Using “Sun-Dried“ Tomatoes in Cooking

Spaghetti squash with dried heirloom tomatoes and parmesan
Spaghetti squash with dried heirloom tomatoes and parmesan

Sally Swift, from the Splendid Table’s How to Eat Weekends blog, had a really interesting way of using dried tomatoes.  I haven’t tried it yet, but I plan to very soon. 

She said: “If you need great tomato taste ASAP, chop them into pieces and doctor them with a dash of fish sauce. Taste and add sugar, and maybe even a little vinegar to get the high notes. The fish sauce brings a meaty umph and the sugar and vinegar bring out the highs and lows. ”  Yum, sounds good to me.

One of my favorite ways of using dried tomatoes is in crockpot chile. Another one I like is to make a sun-dried tomato butter and then freeze it for Winter.

Cheers ……….Dorothy

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Tuesday 14th of September 2021

Can these be stored in the freezer?

dorothy stainbrook

Tuesday 14th of September 2021

Yes they can. Just make sure they are in an airtight freezer bag or something that will prevent any moisture from getting in. If they are dried all the way however there is no need to store in the freezer. Just keep them in the pantry until ready to rehydrate. They don’t go bad if they are dried.

karen visavati

Friday 10th of September 2021

help my tomatoes have been in the dehydrator for over 24 hrs some are crunchy but most are pliable so I cant make powder out of them now what do I do

dorothy stainbrook

Friday 10th of September 2021

Yes, they do get done in phases rather than all at the same time. It depends on the thickness of the skin and the thickness of the cut. Different varieties behave differently, as do different dehydrators. Take out the crunchy ones and set aside and then keep drying the other ones. Sometimes mine do take longer than 24 hours also. It is not an exact science for sure!

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