GreenlyWhen to plant peas in Helena: 28 April – 21 July
In Helena, peas: sow straight into the bed from 28 April to 21 July.
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Peas in Helena: soil, season and weather
Peas tolerates light frost, so it goes in three weeks before the last frost (19 May); the top 7 cm of soil has reached its minimum of 4 °C by then (around 7 April).
| Last spring frost | 19 May |
|---|---|
| Top 7 cm of soil at 4 °C | 7 April, 42 days before the last frost |
| First autumn frost | 3 October, 158 days after the start |
| Days in the bed to the first harvest (card) | 74 |
| First harvest, if planted in this window | 11 July – 3 October |
| Days left for picking | 84 |
| Daylight | 14:13 on 28 April |
| Watering outdoors when fruiting (card) | every 3 days; the driest month, July, has 6 rainy days |
Peas in Helena: care after planting
Planted on 28 April: in the first weeks water every 6 days.
Pests and diseases of peas to watch for:
Weather in Helena during the peas season
About 336 mm of rain falls in the season; July is the driest month (23 mm) and May the wettest (76 mm).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| April | 9.8 | -2.6 | 54 | 10 | 13:33 |
| May | 16.2 | 3.2 | 76 | 13 | 15:00 |
| June | 21.8 | 7.9 | 69 | 11 | 15:49 |
| July | 27.3 | 12.1 | 23 | 6 | 15:29 |
| August | 26.5 | 11.5 | 28 | 5 | 14:14 |
| September | 21.1 | 7.4 | 40 | 7 | 12:36 |
| October | 12 | 0.6 | 46 | 9 | 10:58 |
ERA5 2016–2025, Open-Meteo
Peas in nearby cities
All the nearest cities on our list plant peas earlier than Helena; the closest date is in Missoula, 1 day earlier.
| City | Distance | Date | Difference |
|---|---|---|---|
| Missoula | 155 km | 27 April – 24 July | 1 day earlier |
| Billings | 287 km | 4 April – 1 August | 24 days earlier |
| Idaho Falls | 345 km | 20 April – 1 August | 8 days earlier |
| Spokane | 425 km | 31 March – 2 August | 28 days earlier |
| Boise | 466 km | 25 March – 14 August | 34 days earlier |
| Calgary | 517 km | 22 April – 19 July | 6 days earlier |
Where to buy peas seeds in Helena
Seeds go straight into the bed from 28 April to 21 July; buy them before that. Within 15 km of Helena OpenStreetMap lists 2 farm-supply shops and 6 plant nurseries (collected 28 October 2026).
- Chadwick Nursery — plant nursery
4 km - Valley Farms — plant nursery
5 km - Montana Nursery & Landscape Supply — plant nursery
7 km - Korpi Lawn and Landscape — plant nursery
7 km
Places: © OpenStreetMap contributors, ODbL.
Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.
- How to grow peas
- All frost dates and weather of Helena
- Shops and markets: Helena
- Selling a surplus in the United States
- When to plant peas in the United States
- Helena: #780 of 801 by frost-free season
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant peas in Helena?
In Helena, peas: sow straight into the bed from 28 April to 21 July.
When is the last spring frost in Helena?
Last spring frost around 19 May, first autumn frost around 3 October.
Other crops in Helena, with their dates
- Tomato · 6 June – 13 June
- Cucumber · 3 July – 19 July
- Bell Pepper · 3 July – 25 July
- Eggplant · 3 July – 25 July
- Zucchini · 3 July – 17 July
- Pumpkin · 3 July – 20 July
- Watermelon · 3 July – 5 August
- Garlic · 3 September – 5 November
- Tulip · 3 September – 5 November
- Daffodil · 3 September – 5 November
- Crocus · 3 September – 5 November
- Hyacinth · 3 September – 5 November
