When to plant fava bean in Phoenix

In Phoenix, typical last spring frost is January 17 and typical first fall frost is December 22. Typical last spring frost: January 17. Fava bean in Phoenix is not realistic outdoors: 62 suitable days are fewer than the 80 days this plant usually needs.

Fava bean

How to grow Fava bean Phoenix climate Weekly temperatures and windows

Where are you growing?

I add fleece inside on cold nights

Not realistic outdoors

Comfortable in greenhouse

Not realistic in a cold frame

Fava bean in Phoenix is a good fit in an unheated greenhouse. The suitable growing window of 365 days covers the 80–110 days this plant usually needs.

When to plantJanuary 9 – March 22

Harvest: March 30 – July 31
Season vs crop: 365 grow days vs 80–110 needed
Typical frost (last spring – first fall): January 4 – December 26

Fava bean in Phoenix is a good fit in an unheated greenhouse. The suitable growing window of 365 days covers the 80–110 days this plant usually needs.

Estimate. Protection varies with the cover, the weather and how you vent it.

On clear, still nights an unheated greenhouse can be as cold as outside, so the safer date stays close to the outdoor safer date. Add fleece inside for a few degrees of extra protection.

Cover dates are modelled from weather-model data using published greenhouse studies. They are not measured in your greenhouse. A max–min thermometer inside will tell you more.

Typical last frost estimate range February 5 – January 9, depending on the cover and the night.

Planting conditions

Direct sow
Grow outdoors
Harvest

Local activity windows for this place and growing method. Dashed lines are typical last and first frost.

Suitable growing days in a row365

Days to harvest80–110 days from seed

Jan 9 – Mar 22

Direct sow

Mar 23 – Mar 29

Grow outdoors

Mar 30 – Jul 31

Harvest

Activity	Window	Notes
Direct sow	Jan 9 – Mar 22	Plant outdoors in this window.
Grow outdoors	Mar 23 – Mar 29	Plants grow outdoors until harvest.
Harvest	Mar 30 – Jul 31	Expected harvest from typical days to harvest.

Direct sow
Grow outdoors
Harvest

Based on average frost dates (35 seasons (1991–2025)). Adjust a week or two for your conditions.

Protected frost and sowing dates are modelled estimates from weather-model data and published greenhouse studies, not measured in your greenhouse. A max–min thermometer inside will tell you more.

Planting and growing across the year

Planting is the sow / plant-out window. Growing is daytime air versus this plant’s ideal (15 – 21 °C59 – 70 °F15 – 21 °C (59 – 70 °F)) and tolerable (4 – 24 °C39 – 75 °F4 – 24 °C (39 – 75 °F)) ranges, from modelled cover temperatures for the growing method you selected.

Ideal / plantable
Tolerable
Too cold
Too hot
Outside window

Planting uses sow / plant-out rules; growing shows daytime air against this plant’s ideal and tolerable ranges.

Key dates

Typical last spring frostJanuary 4

Low-risk last spring frostFebruary 1

Typical first fall frostDecember 26

Low-risk first fall frostDecember 2

Frost-free days355

Outdoor sow dateJanuary 9

Direct sow windowJanuary 9 – March 22

Suitable growing windowJanuary 1 – December 31 (365 days)

Expected harvestMarch 30 – July 31

How these dates are judged

Ideal conditions: Daytime air from 15 – 21 °C59 – 70 °F15 – 21 °C (59 – 70 °F).
Suitable conditions: Daytime air from 4 – 24 °C39 – 75 °F4 – 24 °C (39 – 75 °F).
Last frost and first frost: Typical spring and fall frost dates for Phoenix, shown in the key dates.
Days to harvest: 80–110 days from seed, from typical days to harvest.
Sowing window: Dated sow and harvest bars use frost dates, soil minima, night limits, and last-sow count-back from typical crop timing. Air ratings on the weekly chart colour only weeks inside that same window — see weekly temperatures and windows.

Other plants for Phoenix

Calculated by Plan & Plant. Method. Data 35 seasons (1991–2025).

Frost and suitability dates are typical figures from climate statistics.

Based on 35 years (1991–2025) of ERA5-Land data from Open-Meteo, for an area of about 10 km. Typical dates, not a guarantee.

Dates for Phoenix use ERA5-Land cell 33.45, -112.07. How we calculated this · Algorithm 2026-10-season-10.

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