Frost Dates for Mosinee, WI 54455
Last spring frost May 6 · First fall frost September 30 · 147 frost-free days · USDA Zone 5a
ZIP 54455 has about 19,000 people.
Moderate season: 147 frost-free days. Spring frost risk spans April 23–May 20 (27 days). Fall frost risk spans September 21–October 10 (19 days).
Frost probability for 54455
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 20 | May 6 | April 23 |
| Fall (first frost) | September 21 | September 30 | October 10 |
Dates come from NOAA 1971–2000 freeze probabilities at WAUSAU ASOS (19.0 km away); the 50% date is the median year.
Which crops fit a 147-day season in Mosinee
In Mosinee (147 frost-free days, a moderate season), 37 of 56 planner crops fit outright, 18 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 1 | May 20–May 27 | 105 | fits: 80 days to maturity, 105 available after May 20. | May 31 |
| Pepper | Mar 25 | May 20–May 27 | 105 | fits: 75 days to maturity, 105 available after May 20. | Jun 5 |
| Lettuce | Mar 11 | Apr 8–Apr 15 | 182 | two-plantings: Plant Apr 8 and again by Aug 9; both mature before Oct 7. | Aug 9 |
| Carrots | — | Apr 15–Apr 22 | 189 | fits: 70 days to maturity, 189 available after Apr 15. | Jul 29 |
| Cucumber | Apr 15 | May 20–May 27 | 119 | fits: 60 days to maturity, 119 available after May 20. | Jul 4 |
| Beans | — | May 13–May 27 | 133 | fits: 60 days to maturity, 133 available after May 13. | Jul 11 |
| Peas | — | Mar 11–May 20 | 210 | fits: 65 days to maturity, 210 available after Mar 11. | Jul 20 |
| Zucchini | Apr 22 | May 20–May 27 | 119 | fits: 55 days to maturity, 119 available after May 20. | Jul 9 |
| Onion | Feb 11 | Apr 8–Apr 22 | 182 | fits: 100 days to maturity, 182 available after Apr 8. | — |
| Spinach | — | Mar 11–Apr 29 | 224 | two-plantings: Plant Mar 11 and again by Aug 28; both mature before Oct 21. | Aug 28 |
| Kale | Feb 25 | Apr 8–Apr 22 | 196 | two-plantings: Plant Apr 8 and again by Aug 13; both mature before Oct 21. | Aug 13 |
| Broccoli | Mar 11 | Apr 8–Apr 22 | 182 | fits: 80 days to maturity, 182 available after Apr 8. | Jul 5 |
| Cabbage | Mar 11 | Apr 8–Apr 22 | 196 | fits: 70 days to maturity, 196 available after Apr 8. | Jul 29 |
| Radish | — | Mar 11–Jun 3 | 210 | two-plantings: Plant Mar 11 and again by Aug 29; both mature before Oct 7. | Aug 29 |
| Beets | — | Mar 11–Jun 3 | 210 | two-plantings: Plant Mar 11 and again by Jul 30; both mature before Oct 7. | Jul 30 |
| Potatoes | — | Apr 22–Apr 29 | 168 | fits: 90 days to maturity, 168 available after Apr 22. | — |
| Garlic | — | Sep 30 | 252 | overwinter: Plant Sep 30 to Oct 21; harvest the following summer. | Oct 21 |
| Strawberry | — | Apr 1–May 27 | 203 | perennial: A perennial: plant Apr 1; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 8 | May 13–May 20 | 119 | fits: 75 days to maturity, 119 available after May 13. | Jun 12 |
| Pumpkin | Apr 22 | May 20–May 20 | 112 | fits: 100 days to maturity, 112 available after May 20. | — |
| Cauliflower | Mar 25 | Apr 29–May 13 | 161 | fits: 75 days to maturity, 161 available after Apr 29. | Jul 10 |
| Swiss Chard | Mar 11 | Apr 22–Apr 22 | 168 | two-plantings: Plant Apr 22 and again by Jul 30; both mature before Oct 7. | Jul 30 |
| Arugula | — | Mar 11–Jun 3 | 224 | two-plantings: Plant Mar 11 and again by Aug 28; both mature before Oct 21. | Aug 28 |
| Brussel Sprouts | Mar 11 | Apr 8–Apr 22 | 196 | fits: 100 days to maturity, 196 available after Apr 8. | Jun 29 |
| Butternut Squash | Apr 22 | May 20–May 27 | 112 | fits: 100 days to maturity, 112 available after May 20. | — |
| Eggplant | Mar 18 | May 20–May 27 | 105 | fits: 70 days to maturity, 105 available after May 20. | Jun 10 |
| Okra | Apr 8 | May 13–May 20 | 126 | two-plantings: Plant May 13 and again by Jul 9; both mature before Sep 16. | Jul 9 |
| Basil | Apr 1 | May 27–May 27 | 112 | fits: 60 days to maturity, 112 available after May 27. | Jul 4 |
| Cilantro | — | Apr 8–Apr 29 | 182 | two-plantings: Plant Apr 8 and again by Aug 4; both mature before Oct 7. | Aug 4 |
| Parsley | Feb 25 | May 13–May 20 | 147 | fits: 70 days to maturity, 147 available after May 13. | Jul 15 |
| Celery | Feb 25 | May 13–May 27 | 147 | fits: 120 days to maturity, 147 available after May 13. | May 26 |
| Scallions | Feb 25 | Apr 8–Apr 22 | 196 | two-plantings: Plant Apr 8 and again by Aug 8; both mature before Oct 21. | Aug 8 |
| Turnip | — | Apr 8–Apr 22 | 196 | two-plantings: Plant Apr 8 and again by Aug 18; both mature before Oct 21. | Aug 18 |
| Kohlrabi | — | Mar 25–Apr 8 | 210 | two-plantings: Plant Mar 25 and again by Aug 13; both mature before Oct 21. | Aug 13 |
| Bok Choy | Apr 8 | Apr 29–May 6 | 161 | two-plantings: Plant Apr 29 and again by Aug 9; both mature before Oct 7. | Aug 9 |
| Collards | Feb 25 | Apr 8–Apr 22 | 196 | two-plantings: Plant Apr 8 and again by Aug 8; both mature before Oct 21. | Aug 8 |
| Cantaloupe | Apr 22 | May 20–May 27 | 105 | fits: 85 days to maturity, 105 available after May 20. | May 26 |
| Chives | Feb 11 | May 13–May 20 | 161 | fits: 90 days to maturity, 161 available after May 13. | — |
| Dill | — | Mar 11–Jun 3 | 210 | two-plantings: Plant Mar 11 and again by Jul 30; both mature before Oct 7. | Jul 30 |
| Oregano | Feb 25 | May 13–May 20 | 161 | fits: 80 days to maturity, 161 available after May 13. | — |
| Rosemary | Feb 11 | May 13–May 20 | 147 | fits: 80 days to maturity, 147 available after May 13. | — |
| Sage | Mar 11 | May 13–May 20 | 161 | fits: 75 days to maturity, 161 available after May 13. | — |
| Thyme | Feb 25 | May 13–May 20 | 161 | fits: 90 days to maturity, 161 available after May 13. | — |
| Calendula | Mar 25 | Apr 22–May 6 | 168 | two-plantings: Plant Apr 22 and again by Aug 4; both mature before Oct 7. | Aug 4 |
| Cosmos | Apr 8 | May 6–May 20 | 133 | fits: 60 days to maturity, 133 available after May 6. | Jul 4 |
| Lavender | Feb 11 | May 6–May 20 | 168 | fits: 90 days to maturity, 168 available after May 6. | — |
| Marigolds | Mar 25 | May 6–May 13 | 133 | two-plantings: Plant May 6 and again by Jul 14; both mature before Sep 16. | Jul 14 |
| Melons | Apr 22 | May 20–May 27 | 105 | fits: 85 days to maturity, 105 available after May 20. | May 26 |
| Mint | — | May 6–May 20 | 168 | fits: 90 days to maturity, 168 available after May 6. | — |
| Nasturtiums | Apr 8 | May 6–May 13 | 133 | two-plantings: Plant May 6 and again by Jul 9; both mature before Sep 16. | Jul 9 |
| Pole Beans | — | May 13–May 27 | 126 | fits: 65 days to maturity, 126 available after May 13. | Jun 29 |
| Spaghetti Squash | Apr 22 | May 20–May 27 | 112 | fits: 90 days to maturity, 112 available after May 20. | May 28 |
| Sunflowers | — | May 6–May 20 | 133 | fits: 70 days to maturity, 133 available after May 6. | Jun 24 |
| Tomatillos | Mar 11 | May 13–May 20 | 112 | fits: 75 days to maturity, 112 available after May 13. | Jun 5 |
| Watermelon | Apr 22 | May 13–May 20 | 112 | fits: 80 days to maturity, 112 available after May 13. | May 31 |
| Yellow Squash | Apr 22 | May 20–May 27 | 119 | fits: 55 days to maturity, 119 available after May 20. | Jul 9 |
| Zinnias | Apr 8 | May 6–May 20 | 133 | fits: 60 days to maturity, 133 available after May 6. | Jul 4 |
Month by month in Mosinee
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 11), Lavender (Feb 11), Onion (Feb 11), Rosemary (Feb 11), Celery (Feb 25), Collards (Feb 25), +5 more. |
| March | Start indoors: Broccoli (Mar 11), Brussel Sprouts (Mar 11), Cabbage (Mar 11), Lettuce (Mar 11), Sage (Mar 11), Swiss Chard (Mar 11), +6 more. Direct sow from: Arugula (Mar 11), Beets (Mar 11), Dill (Mar 11), Peas (Mar 11), Radish (Mar 11), Spinach (Mar 11), +1 more. |
| April | Start indoors: Basil (Apr 1), Tomato (Apr 1), Bok Choy (Apr 8), Corn (Apr 8), Cosmos (Apr 8), Nasturtiums (Apr 8), +11 more. Direct sow from: Cilantro (Apr 8), Turnip (Apr 8), Carrots (Apr 15), Potatoes (Apr 22). Transplant from: Broccoli (Apr 8), Brussel Sprouts (Apr 8), Cabbage (Apr 8), Collards (Apr 8), Kale (Apr 8), Lettuce (Apr 8), +6 more. Plant: Strawberry (Apr 1). |
| May | Direct sow from: Sunflowers (May 6), Beans (May 13), Pole Beans (May 13). Transplant from: Cosmos (May 6), Lavender (May 6), Marigolds (May 6), Mint (May 6), Nasturtiums (May 6), Zinnias (May 6), +23 more. Last frost around May 6. Last sowing dates: Cantaloupe (May 26), Celery (May 26), Melons (May 26), Spaghetti Squash (May 28), Tomato (May 31), Watermelon (May 31). |
| June | Last sowing dates: Pepper (Jun 5), Tomatillos (Jun 5), Eggplant (Jun 10), Corn (Jun 12), Sunflowers (Jun 24), Brussel Sprouts (Jun 29), +1 more. |
| July | Last sowing dates: Basil (Jul 4), Cosmos (Jul 4), Cucumber (Jul 4), Zinnias (Jul 4), Broccoli (Jul 5), Nasturtiums (Jul 9), +13 more. |
| August | Last sowing dates: Calendula (Aug 4), Cilantro (Aug 4), Collards (Aug 8), Scallions (Aug 8), Bok Choy (Aug 9), Lettuce (Aug 9), +6 more. |
| September | Direct sow from: Garlic (Sep 30). First frost around September 30. |
| October | Last sowing dates: Garlic (Oct 21). |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Mosinee, WI (ZIP 54455)?
The median last spring frost date for Mosinee, WI (ZIP code 54455) is around May 6. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before April 23; one in ten it runs past May 20.
What is the first fall frost date in Mosinee, WI?
The median first fall frost date for Mosinee, WI is around September 30. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around September 21 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Mosinee, WI?
The frost-free growing season in Mosinee is about 147 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Mosinee (147 frost-free days, a moderate season), 37 of 56 planner crops fit outright, 18 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Mosinee, WI?
Mosinee, WI is in USDA hardiness zone 5a (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Mosinee, WI?
Start tomatoes indoors Apr 1 and plant out May 20 in Mosinee. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Mosinee?
Two: plant Apr 8 and again by Aug 9; both mature before Oct 7.
When do I plant garlic in Mosinee?
Sep 30 to Oct 21; it overwinters and is ready the following summer.
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