Can You Grow Coffee in Saku City? I Researched Because I Want to Try

Lead

Hi, I’m Pomarano.

This Daily post is about growing coffee.

I love coffee and usually buy beans and brew at home. Sometimes I wonder what it would be like to grow it myself, so I looked into whether that could work in Saku City, Nagano Prefecture.

This is a research memo based on online sources and nearby examples — costs, scale, revenue, and ways to earn beyond selling beans alone. I haven’t started growing yet.

Japanese version of this post: here

Bottom line (first)

From what I found, coffee in Saku City looks like this:

Open-field cultivation isn’t realistic — a greenhouse (poly tunnel) and temperature control are essential
Nearby Ueda and Tōmi already have “Shinshu coffee” — Saku would face similar technical challenges
Beans alone are tough — domestic yields are small; experiences, processing, and direct sales matter
First harvest takes 3–5 years, sometimes longer — early years are cost-heavy, not revenue-heavy

Not impossible — but there’s a big gap between hobby scale and running it as a business.

Saku’s climate vs. what coffee needs

Arabica coffee generally prefers roughly 20–30°C. It normally grows in the “coffee belt” near the equator.

JMA normal values for Saku (1991–2020):

Item	Saku (normal)
Mean annual temperature	10.9°C
Mean daily minimum in January	-7.2°C
Mean daily maximum in August	30.1°C
Annual precipitation	964 mm
Annual sunshine	2,147 hours

Winters are cold. The annual average is only around 11°C, so leaving trees in an outdoor field through winter seems unlikely. Sunshine is high — if you control the house interior, light could be a plus.

People doing it nearby (reference)

There are already projects within easy reach of Saku.

Shinshu Ueda Tomoe Farm (Ueda / Tōmi)

A manufacturer (Tomoe Industry) started about six years ago; reports say they reached product sales in 2025, with harvest experiences and furusato nozei (hometown tax) gifts (NBS Nagano).
Scale: about 470 coffee trees, two greenhouse sites, Arabica under temperature control.

How the greenhouse works (Ueda examples)

A Suzaka regional blog describes ICT monitoring of inside/outside temperature, automatic fans, AC, roof vents — and geothermal heat pumps to cut energy use (Coffee farm in Nagano?).

For Saku, the common base seems to be greenhouse + environment control + winter heating.

How much per tree? (Japan benchmarks)

Compared with large overseas farms, per-tree yield in Japan is low.

Benchmark	Green bean per tree per year
Okinawa reports	~100 g
Common planning figure	~200 g
Good year	~400 g
Poor year	under 100 g

Many articles use 200 g/tree/year for rough math:

30 trees → ~6 kg green bean/year
100 trees → ~20 kg/year
470 trees (Tomoe scale) → ~94 kg/year (not every year at full yield)

Roasting loses ~15–20%, so 100 trees might give ~15 kg roasted — about 1,000+ cups/year at 12 g per cup.

I also read that this isn’t even one roaster’s daily batch. Volume isn’t how Japan wins, I took that to mean.

Costs by scale (rough)

All figures are estimates. Snow load, wind, and equipment change the total a lot. Get multiple quotes.

A. Trial / hobby (10–30 trees)

Item	Rough cost (JPY)
Greenhouse	¥800k–1.5M (less if reusing an existing house)
Seedlings, pots, etc.	~¥6,000/tree
Temperature control	¥ tens of thousands–200k
Initial total	¥400k–900k
Annual running	¥50k–150k (power, fertilizer)

Good for “will it actually grow?” — not for profit from beans alone.

B. Small side business (50–100 trees)

Item	Rough cost (JPY)
Greenhouse 100–150 m²	¥2.5M–4.5M + site prep & power
Environment control	¥500k–1.5M
100 seedlings	¥300k–600k
Processing (sun-dry focus)	¥ hundreds of thousands+
Small roaster	¥130k–800k
Initial total	¥5M–12M
Annual running	¥500k–1.5M

Winter heating power bills will matter in Nagano.

C. Business (200–500 trees)

At Tomoe-like scale — multiple houses, processing, roasting, staff — think tens of millions of yen upfront. Six years to product launch in their story; quick payback seems unlikely.

Revenue if you only sell beans (rough)

Reference: Okinawa Coffee Association sells green bean at ¥4,000–4,500 per 100 g. Below uses ¥40,000/kg (if everything sold):

Trees	Green bean/year	Bean revenue only
30	6 kg	~¥240k
100	20 kg	~¥800k
470	94 kg	~¥3.76M

At a rare ¥80,000/kg domestic price, 100 trees → ~¥1.6M/year. Even then, with ¥5M+ initial investment for scale B, beans alone won’t easily break even.

Young trees yield less. First real harvest may be 3–5 years (sometimes 6). Easy to forget.

Revenue beyond beans

Successful domestic examples often use sixth-sector agriculture — grow, process, sell, and host experiences.

1. Harvest & farm tours

Tomoe offers cherry picking + tours + tasting as furusato nozei gifts (Tōmi City PR).
One JAL furusato listing: 4 people, ¥20,000 (~¥5,000/person, ~2.5 hours).

Partnering with Saku City could mean a “Saku coffee harvest experience” gift — needs municipal coordination.

2. Roasting & brewing workshops

YACHI★FORNIA-FARM runs 30–40 min hand-roasting and longer harvest-to-cup courses. On-site café drinks around ¥500/cup.

3. By-products (“whole tree”)

Cascara tea (dried cherry skin)
Coffee leaf tea
Cherry tea

The “one whole tree” model — Miyade Coffee Farm and others — adds products when bean volume is small.

4. Seedlings & tree “owners”

Annual “your tree” programs, seedling sales, grower support (e.g. Yamakou Farm’s JAPAN COFFEE PROJECT). Growing itself becomes the content.

5. Brand, direct sales, online

“Shinshu / Saku,” “domestic,” “rare” — gifts, subscriptions, event-only lots. Price and fans, not volume.

Stacked example (100 trees, ideal)

Source	Assumption	Per year
Bean direct sales	20 kg × ¥40k	¥800k
Harvest experience	40 sessions × 4 people × ¥5k	¥800k
Café / roasting	20 cups/day × ¥500 × 120 days	¥1.2M

If everything went well: ~¥2.8M/year. With upfront cost, labor, power, and tree age, the picture only starts to make sense as beans + experience + place.

If I were to try (not decided)

A realistic path might look like:

Phase	Content
Phase 1	~30 trees, small house, verify growth, blog the process
Phase 2	Harvest tours, hand roasting, small direct sales (~100 trees)
Phase 3	Furusato nozei, tourism tie-ins (Karuizawa / Saku area), by-product goods

Jumping straight to 470 trees doesn’t seem realistic. Next steps for me would be visiting Ueda farms and getting greenhouse quotes in Saku.

Side note: domestic coffee is story, not volume

What stuck with me: Japan doesn’t compete on yield. Cold-region greenhouse coffee sells craft, place, rarity, and experience as much as the cup.

Tomoe’s coverage also mentions climate change and applying manufacturing skills to farming. In Saku, “I like coffee” alone might not be enough — you’d probably need why Saku to sell even one bag.

Summary

I love coffee and researched whether cultivation in Saku City is feasible.

Open field: unlikely. Greenhouse + temperature control: required
Cost: from ~¥400k (trial) to ¥5M+ (serious) to tens of millions (business)
At ~200 g/tree/year, beans alone are a hard business case
Experiences, roasting, by-products, direct sales, local partnerships make the model realistic

I haven’t planted anything yet. Farm visits and quotes might come next. If anything moves forward, I’ll post an update in Daily.

Disclaimer

All numbers here are rough estimates from public articles and sites. Confirm costs, yields, regulations, subsidies, and licenses with your city office, JA, contractors, and professionals. Selling food or running farm experiences may require permits.