Frost Dates for Mountain Home, ID 83647
Last spring frost May 14 · First fall frost October 1 · 140 frost-free days · USDA Zone 6b
ZIP 83647 has about 23,000 people.
Moderate season: 140 frost-free days. Spring frost risk spans April 24–June 3 (40 days). Fall frost risk spans September 15–October 16 (31 days).
Frost probability for 83647
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 3 | May 14 | April 24 |
| Fall (first frost) | September 15 | October 1 | October 16 |
Dates come from NOAA 1971–2000 freeze probabilities at MTN HOME (34.0 km away); the 50% date is the median year.
Which crops fit a 140-day season in Mountain Home
In Mountain Home (140 frost-free days, a moderate season), 38 of 56 planner crops fit outright, 17 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 9 | May 28–Jun 4 | 98 | fits: 80 days to maturity, 98 available after May 28. | Jun 1 |
| Pepper | Apr 2 | May 28–Jun 4 | 98 | fits: 75 days to maturity, 98 available after May 28. | Jun 6 |
| Lettuce | Mar 19 | Apr 16–Apr 23 | 175 | two-plantings: Plant Apr 16 and again by Aug 10; both mature before Oct 8. | Aug 10 |
| Carrots | — | Apr 23–Apr 30 | 182 | fits: 70 days to maturity, 182 available after Apr 23. | Jul 30 |
| Cucumber | Apr 23 | May 28–Jun 4 | 112 | fits: 60 days to maturity, 112 available after May 28. | Jul 5 |
| Beans | — | May 21–Jun 4 | 126 | fits: 60 days to maturity, 126 available after May 21. | Jul 12 |
| Peas | — | Mar 19–May 28 | 203 | fits: 65 days to maturity, 203 available after Mar 19. | Jul 21 |
| Zucchini | Apr 30 | May 28–Jun 4 | 112 | fits: 55 days to maturity, 112 available after May 28. | Jul 10 |
| Onion | Feb 19 | Apr 16–Apr 30 | 175 | fits: 100 days to maturity, 175 available after Apr 16. | — |
| Spinach | — | Mar 19–May 7 | 217 | two-plantings: Plant Mar 19 and again by Aug 29; both mature before Oct 22. | Aug 29 |
| Kale | Mar 5 | Apr 16–Apr 30 | 189 | two-plantings: Plant Apr 16 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Broccoli | Mar 19 | Apr 16–Apr 30 | 175 | fits: 80 days to maturity, 175 available after Apr 16. | Jul 6 |
| Cabbage | Mar 19 | Apr 16–Apr 30 | 189 | fits: 70 days to maturity, 189 available after Apr 16. | Jul 30 |
| Radish | — | Mar 19–Jun 11 | 203 | two-plantings: Plant Mar 19 and again by Aug 30; both mature before Oct 8. | Aug 30 |
| Beets | — | Mar 19–Jun 11 | 203 | two-plantings: Plant Mar 19 and again by Jul 31; both mature before Oct 8. | Jul 31 |
| Potatoes | — | Apr 30–May 7 | 161 | fits: 90 days to maturity, 161 available after Apr 30. | — |
| Garlic | — | Oct 1 | 245 | overwinter: Plant Oct 1 to Oct 22; harvest the following summer. | Oct 22 |
| Strawberry | — | Apr 9–Jun 4 | 196 | perennial: A perennial: plant Apr 9; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 16 | May 21–May 28 | 112 | fits: 75 days to maturity, 112 available after May 21. | Jun 13 |
| Pumpkin | Apr 30 | May 28–May 28 | 105 | fits: 100 days to maturity, 105 available after May 28. | — |
| Cauliflower | Apr 2 | May 7–May 21 | 154 | fits: 75 days to maturity, 154 available after May 7. | Jul 11 |
| Swiss Chard | Mar 19 | Apr 30–Apr 30 | 161 | two-plantings: Plant Apr 30 and again by Jul 31; both mature before Oct 8. | Jul 31 |
| Arugula | — | Mar 19–Jun 11 | 217 | two-plantings: Plant Mar 19 and again by Aug 29; both mature before Oct 22. | Aug 29 |
| Brussel Sprouts | Mar 19 | Apr 16–Apr 30 | 189 | fits: 100 days to maturity, 189 available after Apr 16. | Jun 30 |
| Butternut Squash | Apr 30 | May 28–Jun 4 | 105 | fits: 100 days to maturity, 105 available after May 28. | — |
| Eggplant | Mar 26 | May 28–Jun 4 | 98 | fits: 70 days to maturity, 98 available after May 28. | Jun 11 |
| Okra | Apr 16 | May 21–May 28 | 119 | fits: 55 days to maturity, 119 available after May 21. | Jul 10 |
| Basil | Apr 9 | Jun 4–Jun 4 | 105 | fits: 60 days to maturity, 105 available after Jun 4. | Jul 5 |
| Cilantro | — | Apr 16–May 7 | 175 | two-plantings: Plant Apr 16 and again by Aug 5; both mature before Oct 8. | Aug 5 |
| Parsley | Mar 5 | May 21–May 28 | 140 | fits: 70 days to maturity, 140 available after May 21. | Jul 16 |
| Celery | Mar 5 | May 21–Jun 4 | 140 | fits: 120 days to maturity, 140 available after May 21. | May 27 |
| Scallions | Mar 5 | Apr 16–Apr 30 | 189 | two-plantings: Plant Apr 16 and again by Aug 9; both mature before Oct 22. | Aug 9 |
| Turnip | — | Apr 16–Apr 30 | 189 | two-plantings: Plant Apr 16 and again by Aug 19; both mature before Oct 22. | Aug 19 |
| Kohlrabi | — | Apr 2–Apr 16 | 203 | two-plantings: Plant Apr 2 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Bok Choy | Apr 16 | May 7–May 14 | 154 | two-plantings: Plant May 7 and again by Aug 10; both mature before Oct 8. | Aug 10 |
| Collards | Mar 5 | Apr 16–Apr 30 | 189 | two-plantings: Plant Apr 16 and again by Aug 9; both mature before Oct 22. | Aug 9 |
| Cantaloupe | Apr 30 | May 28–Jun 4 | 98 | fits: 85 days to maturity, 98 available after May 28. | — |
| Chives | Feb 19 | May 21–May 28 | 154 | fits: 90 days to maturity, 154 available after May 21. | — |
| Dill | — | Mar 19–Jun 11 | 203 | two-plantings: Plant Mar 19 and again by Jul 31; both mature before Oct 8. | Jul 31 |
| Oregano | Mar 5 | May 21–May 28 | 154 | fits: 80 days to maturity, 154 available after May 21. | — |
| Rosemary | Feb 19 | May 21–May 28 | 140 | fits: 80 days to maturity, 140 available after May 21. | — |
| Sage | Mar 19 | May 21–May 28 | 154 | fits: 75 days to maturity, 154 available after May 21. | — |
| Thyme | Mar 5 | May 21–May 28 | 154 | fits: 90 days to maturity, 154 available after May 21. | — |
| Calendula | Apr 2 | Apr 30–May 14 | 161 | two-plantings: Plant Apr 30 and again by Aug 5; both mature before Oct 8. | Aug 5 |
| Cosmos | Apr 16 | May 14–May 28 | 126 | fits: 60 days to maturity, 126 available after May 14. | Jul 5 |
| Lavender | Feb 19 | May 14–May 28 | 161 | fits: 90 days to maturity, 161 available after May 14. | — |
| Marigolds | Apr 2 | May 14–May 21 | 126 | two-plantings: Plant May 14 and again by Jul 15; both mature before Sep 17. | Jul 15 |
| Melons | Apr 30 | May 28–Jun 4 | 98 | fits: 85 days to maturity, 98 available after May 28. | — |
| Mint | — | May 14–May 28 | 161 | fits: 90 days to maturity, 161 available after May 14. | — |
| Nasturtiums | Apr 16 | May 14–May 21 | 126 | two-plantings: Plant May 14 and again by Jul 10; both mature before Sep 17. | Jul 10 |
| Pole Beans | — | May 21–Jun 4 | 119 | fits: 65 days to maturity, 119 available after May 21. | Jun 30 |
| Spaghetti Squash | Apr 30 | May 28–Jun 4 | 105 | fits: 90 days to maturity, 105 available after May 28. | May 29 |
| Sunflowers | — | May 14–May 28 | 126 | fits: 70 days to maturity, 126 available after May 14. | Jun 25 |
| Tomatillos | Mar 19 | May 21–May 28 | 105 | fits: 75 days to maturity, 105 available after May 21. | Jun 6 |
| Watermelon | Apr 30 | May 21–May 28 | 105 | fits: 80 days to maturity, 105 available after May 21. | Jun 1 |
| Yellow Squash | Apr 30 | May 28–Jun 4 | 112 | fits: 55 days to maturity, 112 available after May 28. | Jul 10 |
| Zinnias | Apr 16 | May 14–May 28 | 126 | fits: 60 days to maturity, 126 available after May 14. | Jul 5 |
Month by month in Mountain Home
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 19), Lavender (Feb 19), Onion (Feb 19), Rosemary (Feb 19). |
| March | Start indoors: Celery (Mar 5), Collards (Mar 5), Kale (Mar 5), Oregano (Mar 5), Parsley (Mar 5), Scallions (Mar 5), +9 more. Direct sow from: Arugula (Mar 19), Beets (Mar 19), Dill (Mar 19), Peas (Mar 19), Radish (Mar 19), Spinach (Mar 19). |
| April | Start indoors: Calendula (Apr 2), Cauliflower (Apr 2), Marigolds (Apr 2), Pepper (Apr 2), Basil (Apr 9), Tomato (Apr 9), +15 more. Direct sow from: Kohlrabi (Apr 2), Cilantro (Apr 16), Turnip (Apr 16), Carrots (Apr 23), Potatoes (Apr 30). Transplant from: Broccoli (Apr 16), Brussel Sprouts (Apr 16), Cabbage (Apr 16), Collards (Apr 16), Kale (Apr 16), Lettuce (Apr 16), +4 more. Plant: Strawberry (Apr 9). |
| May | Direct sow from: Sunflowers (May 14), Beans (May 21), Pole Beans (May 21). Transplant from: Bok Choy (May 7), Cauliflower (May 7), Cosmos (May 14), Lavender (May 14), Marigolds (May 14), Mint (May 14), +24 more. Last frost around May 14. Last sowing dates: Celery (May 27), Spaghetti Squash (May 29). |
| June | Transplant from: Basil (Jun 4). Last sowing dates: Tomato (Jun 1), Watermelon (Jun 1), Pepper (Jun 6), Tomatillos (Jun 6), Eggplant (Jun 11), Corn (Jun 13), +3 more. |
| July | Last sowing dates: Basil (Jul 5), Cosmos (Jul 5), Cucumber (Jul 5), Zinnias (Jul 5), Broccoli (Jul 6), Nasturtiums (Jul 10), +13 more. |
| August | Last sowing dates: Calendula (Aug 5), Cilantro (Aug 5), Collards (Aug 9), Scallions (Aug 9), Bok Choy (Aug 10), Lettuce (Aug 10), +6 more. |
| September | First fall frost approaching (around October 1). Transplant fall brassicas. Sow spinach, arugula, and radishes. |
| October | Direct sow from: Garlic (Oct 1). First frost around October 1. Last sowing dates: Garlic (Oct 22). |
| November | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
| 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 Mountain Home, ID (ZIP 83647)?
The median last spring frost date for Mountain Home, ID (ZIP code 83647) is around May 14. 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 24; one in ten it runs past June 3.
What is the first fall frost date in Mountain Home, ID?
The median first fall frost date for Mountain Home, ID is around October 1. 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 15 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Mountain Home, ID?
The frost-free growing season in Mountain Home is about 140 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 Mountain Home (140 frost-free days, a moderate season), 38 of 56 planner crops fit outright, 17 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Mountain Home, ID?
Mountain Home, ID is in USDA hardiness zone 6b (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 Mountain Home, ID?
Start tomatoes indoors Apr 9 and plant out May 28 in Mountain Home. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Mountain Home?
Two: plant Apr 16 and again by Aug 10; both mature before Oct 8.
When do I plant garlic in Mountain Home?
Oct 1 to Oct 22; it overwinters and is ready the following summer.
Which nearby ZIP has a longer season?
Boise (ZIP 83712) has 154 frost-free days, 14 more than Mountain Home (ZIP 83647). See Boise ZIP 83712 frost dates
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