How to Grow Adzuki Beans USA
On this page
In the US, adzuki beans are ready to harvest 80–120 days after planting.
Adzuki beans (Vigna angularis) — Frost-tender annual, though the least heat-demanding of this group and the one most suited to a temperate summer.
The short answer
- Ready in
- 80–120 days
- Site
- soil pH 5–7.5
Adzuki Bean (Vigna angularis)
2 sources cited
Quick Facts
Soil & Growing Conditions
Harvest & Storage
Adzuki bean through the season
Plan your Adzuki Beans planting
When to sow and plant Adzuki Beans depends on your own frost dates. Check the USA vegetable planting calendar. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.
What the research guides add
Adzuki is a dry-bean crop, which means the number that matters is how long it needs to stay in the ground.
- The plant is erect, 1 to 2 feet high, with yellow flowers followed by clusters of small cylindrical pods. (UF/IFAS Extension)
- Adzuki beans need about 120 days from sowing to the time the seeds and pods are dry. (UF/IFAS Extension)
- They need cool nights for best production but will not tolerate frosts and freezes, so plant during the traditional frost-free period. (UF/IFAS Extension)
- Sow seeds ¾ to 1 inch deep and thin the plants to stand about 2 to 3 inches apart in the row; prepare the soil and plant very much as for green snap beans. (UF/IFAS Extension)
- Young tender pods can be picked as snap beans, but they are very small at that stage. The dry pods split open and scatter the seeds, so harvest after the seeds are ripe but before they shatter. (UF/IFAS Extension)
- The whole plant with dry pods attached can be pulled and stacked in a dry, well-ventilated place; a week or two is usually enough to dry it completely. (UF/IFAS Extension)
Adzuki bean in the USA: climate data
The sources give 120–120 days from sowing to harvest (UF/IFAS Extension). NOAA’s median freeze-free season runs from 136 days in Bismarck, ND to 365 days in Phoenix Sky Harbor, AZ; in every one of the cities it is at least as long as the quickest time given.
| City | USDA zone | Last spring freeze (32°F) | First fall freeze (32°F) | Freeze-free days | Against 120 days to harvest |
|---|---|---|---|---|---|
| Bismarck, ND | 4a | 14 May | 27 Sep | 136 | +16 spare days |
| Madison, WI | 5b | 1 May | 10 Oct | 160 | +40 spare days |
| Milwaukee, WI | 6a | 19 Apr | 29 Oct | 192 | +72 spare days |
| Atlanta, GA | 8a | 15 Mar | 20 Nov | 252 | +132 spare days |
| Orlando, FL | 10a | 25 Jan | winter freezes only | 355 | +235 spare days |
| San Diego, CA | 11a | none in a median year | none in a median year | 365 | +245 spare days |
Dates are the median 32°F freeze dates and freeze-free days from NOAA NCEI U.S. Climate Normals 1991–2020; zones come from the USDA 2023 Plant Hardiness Zone Map (ZIP code of each city centre). The last column is the freeze-free season minus the longest time to harvest the sources give; it is arithmetic, not a forecast, and the soil still has to warm before sowing, which uses up some of the spare days. These are medians, so a cold year can be shorter.
Sources for this section
Section researched and checked on 25 October 2026 by the SoilCommander Editorial Team. How we check facts: editorial policy.
Last verified 2026-10-25
Growing Adzuki Bean in another region
Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.
Sources
The full list of 2 sources behind this guide (Plant Resources of Tropical Africa (PROTA), Useful Tropical Plants (tropical.theferns.info)) is in the references of our UK guide to adzuki beans; they describe the plant itself, which is the same wherever it grows.
Frequently Asked Questions
How long do adzuki beans take to grow?
Typically 80–120 days, depending on cultivar and growing conditions.
What soil pH do adzuki beans need?
A pH of about 5–7.5. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
Plan next season before the problems start
Almost everything on this page resolves to your own frost dates rather than the calendar — the last spring frost moves by roughly two months between zone 3 and zone 10. The USA Garden Planner works from your zone so the timing is already decided before the season starts.
Get the USA Garden Planner →Instant PDF download · Written for US growing conditions
How this guide is put together
The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against USDA hardiness-zone and frost-date data, with Cooperative Extension sources cited directly where one exists for a crop. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.
Related guides
More from the same group (peas & beans):
Growing advice for your part of the USA
Timing and conditions change a lot inside one country. These guides cover frost dates and growing seasons region by region.
Where To Go From Here
Take this crop from reading into a written plan for your own beds.
Keep going
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.