MICROGREEN BUSINESS GUIDE · SAN MATEO, CA

Start a microgreen business in San Mateo, CA.

Most San Mateo kitchens serving microgreens are split between out-of-town distributors and a handful of local growers stretched thin. The restaurants along B Street and 25th Avenue plate greens trucked in from outside the county. The San Mateo grower who fixes that first becomes the default local supplier.

Quick Answer

You can start a microgreen business in San Mateo with under $400 in initial equipment and grow it into a $3,000 to $8,000 per month side income within 90 days. Here is the local demand picture, the unit economics at San Mateo wholesale prices, and the operating system used by working microgreen farms.

How many of the kitchens on B Street and out toward the 25th Avenue corridor right now are plating microgreens that did not come from anywhere inside San Mateo County?

What San Mateo buys today

San Mateo has one of the densest downtown restaurant scenes on the Peninsula, with B Street pulling chef-driven concepts and the broader corridor reflecting the city's deep cultural mix. The demographic skews tech-employed, high-income, and food-aware, which is the exact buyer who pays premium for delicate, same-day local produce.

The Saturday farmers market downtown pulls a steady, willing-to-pay buyer base. The juice and wellness culture across the corridor and the natural grocery channel layer in direct-to-consumer demand alongside the restaurant base.

For indoor growing, the coastal climate is unusually friendly. Mild year-round temperatures hold a garage or spare-room grow space comfortably inside the productive window with minimal intervention, which keeps electricity costs predictable and yields consistent.

Every month you delay, another San Mateo restaurant signs a 12-month supply line with a distributor outside the county. What does it cost you over a two-year horizon at Peninsula wholesale prices?

The math, in San Mateo prices

San Mateo sits at the upper end of California wholesale pricing, with chef-driven Peninsula accounts paying a meaningful premium for genuinely same-day local trays. Here is what the unit economics look like at conservative San Mateo numbers.

Startup cost

$400

Trays, soil, seed, lights. Used gear cuts this in half.

Per-tray net

$20-$30

After seed, soil, packaging, delivery.

Trays per week

100

Target for $3K-$5K/mo at San Mateo pricing.

Break-even week

Week 4

First positive cash week. Most growers hit it.

What that looks like in San Mateo square footage

A 10 by 10 foot room with two vertical shelving units holds 60 to 80 active trays. That is enough to produce $3,000 to $5,000 per month in San Mateo at standard wholesale prices. A two-car garage doubles it. A basement triples it.

What does your week look like when the B Street kitchens are on standing Tuesday delivery, the 25th Avenue corridor is on Thursday, and the Saturday market is a routine cash channel?

Three things every working microgreen farm in San Mateo runs on

  1. A seed density and watering plan you trust. The number one cause of failed trays for new growers is over- or under-seeding. The cheat sheet inside Grown Like A Pro gives you grams per 10x20, soak hours, blackout days, harvest day, and watering for sixty-one varieties.
  2. A rotation tracker. Once you are running thirty-plus trays per week, you cannot remember what is in blackout, what is in light growth, what harvests Tuesday. A spreadsheet works for the first month. After that you need a system that pings you the day before each harvest and reorders seed before you run out.
  3. A customer + invoice layer. Restaurants in San Mateo want predictable weekly invoices and net-15 terms. Farmers market customers want clamshell tracking. Both want consistency. The app handles both.

The IKEA test

If you can follow an IKEA instruction sheet without screaming at the family, you can grow microgreens at a commercial level in San Mateo. The steps are about that difficulty: open the box, lay out the parts, follow the picture, repeat. Trays are the bookcase. Seed is the dowels.

If you ever did struggle with the IKEA bookshelf, that is exactly why Glappy lives inside the app. Glappy is the in-app coach that breaks every step down barney style, in your own language, from "how do I plant my first tray" to "why is this tray going leggy at day five and what do I do about it tonight." Type the question, get a step-by-step answer. There is no question too basic. The whole point is that a San Mateo grower starting today is not on their own.

What you are not buying

You are not buying a course. You are not buying a hype product. You are not buying seed from us, and you are not buying trays from us. We do not sell either. Grown Like A Pro is the operating system you run your San Mateo farm on. The growing happens in your basement.

Try Grown Like A Pro free for 30 days →

San Mateo microgreen FAQ

How much can I make growing microgreens in San Mateo?
A working microgreen farm in San Mateo produces $3,000 to $8,000 per month within 90 days of starting. The math: 100 trays per week, $20 to $30 net revenue per tray, harvested in a basement, garage, or spare room. The ceiling is set by how many restaurants and farmers market customers you can serve, not by the growing setup.
Is it legal to sell microgreens in CA?
Yes. In most of California, microgreens fall under the state's cottage food law for direct-to-consumer retail at farmers markets and to private customers. Restaurant wholesale typically requires a basic food handler permit. Verify with the California Department of Agriculture before you sign a wholesale contract.
What microgreens sell best in San Mateo?
Sunflower, pea shoots, and radish are the three highest-volume sellers in nearly every U.S. city, including San Mateo. Broccoli is the highest-margin variety because of its sulforaphane reputation with health-focused buyers. Specialty varieties like amaranth and shiso command premium pricing from chef-driven restaurants.
How much space do I need to grow microgreens in San Mateo?
A 10 by 10 foot room with two shelving units holds 60 to 80 active trays, which is enough to produce $3,000 to $5,000 per month. A basement, garage corner, spare bedroom, or sunroom all work in San Mateo's climate. Vertical shelving is the fastest path to higher revenue per square foot.
What is the best app for tracking microgreen production in San Mateo?
Grown Like A Pro is the operating system used by working microgreen farms in San Mateo. It handles seed density math, watering schedules, harvest timing, inventory, customer orders, and the financial side. Free 30-day trial with no credit card.
How long does it take to learn to grow microgreens commercially?
Most growers in San Mateo are selling their first trays within 30 days of starting. Commercial proficiency, meaning you can run 50-plus trays per week without losing crops to mold or under-seeding, takes 60 to 90 days. The seed density and watering math is the single biggest predictor of how fast you get there.
Do I need a license to sell microgreens in San Mateo?
For farmers market and direct-to-consumer sales in San Mateo, most growers operate under California's cottage food law with no special license. For wholesale to restaurants and grocery stores, you typically need a basic food handler permit, a sales tax permit, and depending on volume, an inspection from your county health department.
How do I price microgreens to restaurants in San Mateo?
Restaurant wholesale in San Mateo runs $1.50 to $2.50 per ounce for standard varieties, $3 to $5 per ounce for specialty varieties like shiso, micro basil, or amaranth. Sell by the pound for repeat accounts. Local fresh commands a premium over the shipped-in product that most San Mateo restaurants currently buy.

Related guides

Once you have the San Mateo math in your head, the next read is the density chart that drives every tray you plant.

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