When to Plant Beans in St. John's

Can Beans Mature in St. John's?

Growing degree days measure how much useful warmth the season provides. For warm-season crops like beans, GDD helps show whether local heat accumulation is usually strong enough for the crop to grow steadily and finish before fall.

From the usual planting window, St. John's typically provides about 1066 growing degree days for beans. With a typical crop target of 900, that leaves a heat margin of +166. That heat margin usually gives the crop enough room to finish, but not so much that delays stop mattering. Timing and variety choice still affect how comfortably the crop fits.

When Is It Too Late to Plant?

If planting later than usual, this table shows how much growing degree day heat is still available from each point in the season. It is most useful for judging how much flexibility you still have before the crop starts losing margin.

How Different Bean Varieties Affect Results

In St. John's, very early to mid-season bean varieties are usually the best fit in a typical year. Slower choices can still work when gardeners want their specific qualities and do not give away margin through delay.

Varieties that often fit well here include:

• Provider — a dependable early bean often chosen where cool starts and shorter seasons are common
• Mascotte — compact and relatively quick, making it useful where gardeners want a fast return
• Contender — valued for earliness and steadiness, especially in variable conditions
• Blue Lake — a classic bean with strong garden appeal when the season comfortably supports it
• Kentucky Wonder — productive and popular, though it benefits from a decent amount of warm weather
• Roma II — a reliable Italian-type bean that usually works well where planting is timely

Main risk: The usual risk here is losing time early, since delayed planting or cool starts can slow maturity for longer-season bean varieties.

How Frost Affects Planting Dates for Beans in St. John's

St. John's usually has about 143 frost-free days, with a typical last spring frost around May 28 and a typical first fall frost around October 18.

Beans are generally frost-tender and temperatures below about 32°F ( 0 °C) can slow growth or damage plants.

Beans are much more exposed to frost risk, so the frost dates matter as real planting boundaries rather than rough planning markers.

The usual trouble comes from delayed planting or from choosing slower varieties when the local season would reward simpler, faster choices.

In St. John's, beans usually have enough season to work well, but site warmth still affects how comfortably they finish before the usual fall frost around October 18. Local gardens do not all warm and cool at the same pace. The warmest garden spots are usually south-facing walls, sheltered gardens, raised beds, and sunnier urban lots. Cooler spots like low spots, exposed sites, and shadier yards tend to warm up later and usually provide less heat. For beans, warmer sites usually help through quicker early growth and more even production.