Climate-based bean planting guide for Anchorage, Alaska
When to Plant Beans in Anchorage: Timing and Maturity Guide
Beans are more marginal in Anchorage because the season is workable but not roomy. Timing, variety speed, and warm placement usually need to be part of the plan.
Typical Planting Window
Use the planting dates below for beans in Anchorage.
Gardeners usually sow outdoors around May 1. Most varieties need about 50–65 days to reach maturity.
Beans are possible in Anchorage, though this is the kind of crop where the margin is narrow enough that small choices start to matter a lot.
Beans can work here, but the local season does not leave much room for delays or slower choices.
Best local strategy: Sow as early as conditions safely allow and lean toward faster-maturing varieties.
Can Beans Mature in Anchorage?
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, Anchorage typically provides about 740 growing degree days for beans. With a typical crop target of 900, that leaves a heat margin of -160. That narrow heat margin means small delays or slower varieties can quickly reduce the odds of timely maturity.
GDD Checkpoints for Anchorage
When planting later than usual, this table shows how much growing degree day heat is still available from each point in the season. As planting gets pushed back, the remaining heat drops and the crop becomes less likely to mature on time.
| Checkpoint | Remaining GDD | Heat margin | Fit vs typical target |
|---|---|---|---|
| Apr 15 | 740 | -160 | Usually short |
| Jun 1 | 727 | -173 | Usually short |
| Jun 15 | 667 | -233 | Usually short |
| Jul 1 | 546 | -354 | Usually short |
Best Bean Varieties for Anchorage
In Anchorage, very early and early bean varieties are usually the safest choice because they leave the least room for the season to turn against you. Slower classes are much less forgiving here.
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
| Variety class | Typical days to maturity | Typical GDD need | Local fit |
|---|---|---|---|
| Very early | 45–52 | 725 | Tight |
| Early | 50–55 | 800 | Tight |
| Mid-season | 55–65 | 900 | Poor fit |
| Late | 65–75 | 1000 | Poor fit |
Main risk: This is close enough that any delay in planting, or any extra days to maturity, can be the difference between finishing and falling short before frost.
How Frost Affects Beans in Anchorage
Anchorage usually has about 151 frost-free days, with a typical last spring frost around May 1 and a typical first fall frost around September 29.
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 most common problem is running short on season. Late planting, slower varieties, and cooler exposed sites can turn a possible crop into a disappointing one.
In Anchorage, beans usually have enough season to work well, but site warmth still affects how comfortably they finish before the usual fall frost around September 29. 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, the main gain is faster early growth and a bit more time for pod production before the season fades.
Related crops
Related crops worth comparing for the same city:
For a broader local overview, see the Anchorage planting guide. You can also use the Growing Degree Day Planner to test planting dates and crop timing.