What to plant this week in Billings, MT
Billings gardeners are in a strict winter hold until mid-May, as the average last frost doesn't arrive until May 8th. With temperatures regularly dipping to -20°F and no current harvest or planting windows, your primary job this week is cold-weather preparation rather than active growth.
The next 7 days
Billings, MTGrowing in Billings right now
- Wait for stable soil thaw after our typical spring snowmelt before attempting any spring sowing or transplanting in early April.
- Focus your energy now on applying 4 inches of protective mulch to gardens once the ground freezes solid to prevent heaving during freeze-thaw cycles.
- Start seedlings indoors under grow lights this week; Billings' short daylight hours mean starting too late will cut your summer season dangerously short.
- Check drainage in low-lying valley areas where frost pockets can delay spring warming by several weeks compared to higher elevations.
Sow this week
No direct sowing windows open this week.
Transplant this week
Nothing is due to go out this week.
Harvest soon
No harvest windows opening just yet.
Seasonal tips
- Finish clearing debris from last year's garden to reduce winter pests and diseases.
- Apply a thick layer of mulch over perennial beds once the ground has frozen solid to prevent heaving.
- Plan your spring succession schedule by calculating days-to-maturity for crops you want in early summer.
Pest & disease watch
- Monitor for winter moth egg hatching as temperatures rise above freezing, though significant pressure won't hit until soil warms in May.
- Inspect evergreen shrubs and trees for winter damage or rodent gnawing as they seek shelter from our harsh Montana winters.
- Keep an eye on stored bulbs and tubers if you have brought them inside early, ensuring they remain dry to prevent rot before the next season.
Watering this week
Avoid watering the garden until the ground thaws to prevent ice formation that could damage root systems.
Now is an excellent time to sharpen your tools and organize your seed inventory so you are ready to plant immediately when the frost date passes.
Billings gardening questions
3Can I transplant tomatoes or peppers now in Billings?
No, do not attempt any outdoor transplants yet. With the average last frost on May 8th and current soil temperatures far too low, moving tender plants outside will result in immediate cold damage or death.
What is the best time to start my vegetable seeds indoors for a Billings summer?
Aim to have your warm-season crops like tomatoes, peppers, and eggplants hardened off by early May 1st. Starting seeds 6-8 weeks before that target date, around late February or very early March, is critical because our frost-free window only lasts about two months.
How does the -20°F minimum temperature affect my perennial garden?
Most native perennials are adapted to these lows, but mulching heavily after the ground freezes helps prevent root heaving. Ensure any tender perennials you lifted last fall are stored in a frost-free location like an unheated garage or basement.
Other cities in zone 5a
6See the full zone 5a guide → · Plan your Billings garden in SproutGuide →