Manitoba · Growing Zone 3b
Gardeners in Lac du Bonnet, MB can expect the average last spring frost around May 28, and the first fall frost around September 15, based on historical Environment Canada frost data for the area. That gives Lac du Bonnet a frost-free growing season of roughly 110 days. Actual frost dates shift by a week or two year to year, so use this as a planning baseline rather than an exact guarantee, and always check your local forecast before moving tender plants outside.
You have your Lac du Bonnet frost dates. Now put them to work: GrowBlock counts back your indoor seed-starting weeks, marks your safe planting day, warns you before a frost, and lays your whole season out on one timeline.
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Most warm-season crops (tomatoes, peppers, squash) need transplanting only after the last frost has passed, and are usually started indoors 6 to 8 weeks before that date. Cold-hardy crops (peas, lettuce, spinach) can often go in the ground a few weeks before the last frost. As Lac du Bonnet's first fall frost approaches in September, it's time to plan the last harvests for anything frost-sensitive still in the ground.
Approximate dates for common crops in Lac du Bonnet, worked out from the local last frost around May 28. Warm crops go out after frost, cold-hardy crops a few weeks before it, and anything with an indoor start is counted back from its sow date.
| Crop | Start indoors | Sow / transplant out | Approx. harvest |
|---|---|---|---|
| 🍅 Tomato | April 23 | June 11 | August 30 |
| 🌶️ Pepper | April 9 | June 11 | August 25 |
| 🥒 Cucumber | — | June 4 | August 1 |
| 🥬 Zucchini | — | June 4 | July 24 |
| 🥬 Lettuce | — | May 7 | June 21 |
| 🥬 Spinach | — | May 7 | June 24 |
| 🫛 Peas | — | May 7 | July 8 |
| 🥕 Carrots | — | May 7 | July 14 |
| 🫘 Bush beans | — | May 28 | July 17 |
| 🥬 Kale | April 9 | May 7 | July 1 |
Guideline dates from Lac du Bonnet's average frost window, not a guarantee. GrowBlock tunes these to each variety you plant and adjusts as you build your beds.
This calendar is a starting point. In GrowBlock every date is tuned to the exact varieties you plant and updates as you lay out your beds, and you can share the plan with whoever you garden with, changes show up for both of you.
Build your Lac du Bonnet garden planAround May 28 on average, though it can vary by a week or two either way depending on the year.
Lac du Bonnet is in zone 3b, with a frost-free season of about 110 days.
Now that you have your dates, here is how to put them to work through the season:
More how-to on the GrowBlock gardening blog.
See frost dates for all Canadian cities covered by GrowBlock.