Les quatre dates qui comptent
| Date | Quand | Ce que cela veut dire |
|---|---|---|
| Dernier gel de printemps (50 %) | Apr 16 | Une année sur deux gèle après cette date. C’est une moyenne, pas une garantie. |
| Dernier gel de printemps (10 %) | May 3 | Une année sur dix seulement gèle après. À retenir pour ce que vous ne pouvez pas vous permettre de resemer. |
| Premier gel d’automne (50 %) | Oct 28 | Une année sur deux gèle avant cette date. Les cultures d’automne se comptent à rebours depuis là. |
| Premier gel d’automne (10 %) | Oct 16 | Une année à gel précoce. Si une culture doit finir, visez une récolte avant cette date. |
Semis de printemps et d’été à Dayton
Les dates sont calculées à partir du dernier gel propre à ce lieu, pas d’un tableau générique par zone. Les « meilleurs jours lunaires » sont les jours de chaque fenêtre qui tombent dans la phase traditionnelle de la culture — la règle même de l’application.
| Culture | Semis à l’abri | Plantation dehors | Meilleurs jours lunaires | Jours avant récolte |
|---|---|---|---|---|
| Strawberry (crowns) transplant |
— | Feb 15 – Mar 26 | Mar 3 Full Moon |
perennial — first real harvest next season |
| Garlic cloves/sets Mieux vaut semer en automne — voir plus bas |
— | Feb 28 – Mar 31 | Mar 4–9 Waning Gibbous |
240–300 |
| Asparagus (crowns) transplant |
— | Mar 5 – Apr 9 | Mar 25 First Quarter |
perennial — first real harvest 2–3 years |
| Chives either |
Feb 19 | Mar 5 – Apr 9 | Mar 19–24 Waxing Crescent |
75–90 |
| Onion (from sets/transplants) cloves/sets |
— | Mar 5 – Apr 9 | Mar 5–10 Waning Gibbous |
90–120 |
| Peas (English/snap) direct sow |
— | Mar 5 – Apr 9 | Mar 25 First Quarter |
55–75 |
| Spinach direct sow |
— | Mar 5 – Apr 9 | Mar 19–24 Waxing Crescent |
35–50 |
| Cabbage transplant |
Feb 12 | Mar 12 – Apr 9 | Mar 19–24 Waxing Crescent |
65–90 |
| Collards either |
Mar 5 | Mar 12 – Apr 30 | Mar 19–24 Waxing Crescent |
55–85 |
| Kale either |
Mar 5 | Mar 12 – Apr 16 | Mar 19–24 Waxing Crescent |
50–65 |
| Lettuce (leaf) either |
Mar 12 | Mar 12 – May 7 | Mar 19–24 Waxing Crescent |
40–55 |
| Potato cloves/sets |
— | Mar 12 – Apr 16 | Apr 1 Full Moon |
70–120 |
| Radish direct sow |
— | Mar 12 – May 7 | Apr 2–7 Waning Gibbous |
22–35 |
| Turnip direct sow |
— | Mar 12 – Apr 23 | Apr 2–7 Waning Gibbous |
40–60 |
| Broccoli transplant |
Feb 12 | Mar 17 – Apr 16 | Mar 19–24 Waxing Crescent |
55–80 |
| Brussels Sprouts transplant |
Feb 12 | Mar 17 – Apr 16 | Mar 19–24 Waxing Crescent |
90–110 |
| Leek transplant |
Feb 5 | Mar 17 – Apr 16 | Apr 2–7 Waning Gibbous |
100–120 |
| Lettuce (head) transplant |
Feb 26 | Mar 17 – Apr 16 | Mar 19–24 Waxing Crescent |
60–85 |
| Parsley either |
Feb 12 | Mar 17 – Apr 23 | Mar 19–24 Waxing Crescent |
70–90 |
| Parsnip direct sow |
— | Mar 17 – Apr 23 | Apr 1 Full Moon |
100–150 |
| Shallot cloves/sets Mieux vaut semer en automne — voir plus bas |
— | Mar 17 – Apr 16 | Apr 2–7 Waning Gibbous |
90–120 |
| Beet direct sow |
— | Mar 19 – May 7 | Apr 1, May 1 Full Moon |
50–65 |
| Kohlrabi either |
Mar 5 | Mar 19 – Apr 23 | Mar 19–24 Waxing Crescent |
45–60 |
| Carrot direct sow |
— | Mar 26 – May 7 | Apr 1, May 1 Full Moon |
65–85 |
| Cauliflower transplant |
Feb 12 | Mar 26 – Apr 16 | — Waxing Crescent |
55–80 |
| Cilantro direct sow |
— | Mar 26 – May 7 | Apr 18–22 Waxing Crescent |
45–70 |
| Swiss Chard direct sow |
— | Mar 26 – May 16 | Apr 18–22 Waxing Crescent |
50–60 |
| Dill direct sow |
— | Apr 2 – May 16 | Apr 18–22 Waxing Crescent |
40–60 |
| Cucumber either |
Mar 26 | Apr 16 – May 16 | Apr 23 First Quarter |
50–70 |
| Green Beans (bush) direct sow |
— | Apr 16 – May 31 | Apr 23, May 23 First Quarter |
50–65 |
| Oregano transplant |
Feb 19 | Apr 16 – May 7 | Apr 23 First Quarter |
cut as needed |
| Sage transplant |
Feb 19 | Apr 16 – May 7 | Apr 23 First Quarter |
cut as needed |
| Sweet Corn direct sow |
— | Apr 16 – May 31 | Apr 23, May 23 First Quarter |
60–100 |
| Thyme transplant |
Feb 19 | Apr 16 – May 7 | Apr 23 First Quarter |
cut as needed |
| Zucchini / Summer Squash either |
Mar 26 | Apr 16 – May 16 | Apr 23 First Quarter |
45–60 |
| Basil either |
Mar 5 | Apr 23 – May 16 | — Waxing Crescent |
30–60 |
| Dry Beans direct sow |
— | Apr 23 – May 21 | Apr 23 First Quarter |
85–100 |
| Pole Beans direct sow |
— | Apr 23 – May 26 | Apr 23, May 23 First Quarter |
60–75 |
| Pumpkin direct sow |
Mar 26 | Apr 23 – May 21 | Apr 23 First Quarter |
90–120 |
| Rosemary transplant |
Apr 16 | Apr 23 – May 16 | Apr 23 First Quarter |
cut as needed |
| Tomatillo transplant |
Mar 5 | Apr 23 – May 16 | Apr 23 First Quarter |
60–75 |
| Tomato transplant |
Mar 5 | Apr 23 – May 16 | Apr 23 First Quarter |
60–85 |
| Winter Squash direct sow |
Mar 26 | Apr 23 – May 21 | Apr 23 First Quarter |
85–110 |
| Cantaloupe / Muskmelon either |
Mar 26 | Apr 30 – May 21 | — First Quarter |
75–90 |
| Eggplant transplant |
Feb 19 | Apr 30 – May 21 | — First Quarter |
60–90 |
| Okra direct sow |
Mar 19 | Apr 30 – May 26 | May 23 First Quarter |
50–70 |
| Pepper transplant |
Feb 19 | Apr 30 – May 21 | — First Quarter |
60–90 |
| Sweet Potato slips |
— | Apr 30 – May 26 | May 2–7 Waning Gibbous |
90–150 |
| Watermelon either |
Mar 26 | Apr 30 – May 21 | — First Quarter |
70–90 |
Semis d’automne à Dayton
Les dates d’automne se comptent à rebours depuis le premier gel, et elles rajoutent du temps pour le « facteur d’automne » : les jours raccourcissent et refroidissent, donc une culture pousse plus lentement que ne le promet le sachet. Semer trop tard est de loin la première cause d’échec d’un potager d’automne.
| Culture | Semer ou mettre en place | Meilleurs jours lunaires | Jours avant récolte | Rusticité |
|---|---|---|---|---|
| Tomato | Jun 12 – Jul 18 | Jun 21 | 60–85 | very tender |
| Brussels Sprouts | Jun 15 – Jul 2 | Jun 15–20 | 90–110 | hardy |
| Potato | Jun 20 – Jul 22 | Jun 29 | 70–120 | semi-hardy |
| Sweet Corn | Jun 25 – Jul 18 | — | 60–100 | tender |
| Pole Beans | Jul 5 – Jul 18 | — | 60–75 | tender |
| Parsley | Jul 8 – Jul 22 | Jul 15–20 | 70–90 | semi-hardy |
| Okra | Jul 10 – Aug 9 | Jul 21 | 50–70 | very tender |
| Cabbage | Jul 15 – Jul 27 | Jul 15–20 | 65–90 | hardy |
| Carrot | Jul 15 – Jul 27 | — | 65–85 | semi-hardy |
| Collards | Jul 15 – Aug 6 | Jul 15–20 | 55–85 | hardy |
| Cucumber | Jul 15 – Jul 28 | Jul 21 | 50–70 | tender |
| Broccoli | Jul 20 – Aug 6 | Jul 20 | 55–80 | hardy |
| Cauliflower | Jul 20 – Aug 6 | Jul 20 | 55–80 | semi-hardy |
| Green Beans (bush) | Jul 20 – Jul 28 | Jul 21 | 50–65 | tender |
| Lettuce (head) | Jul 20 – Aug 1 | Jul 20 | 60–85 | semi-hardy |
| Peas (English/snap) | Jul 20 – Aug 6 | Jul 21 | 55–75 | hardy |
| Beet | Jul 25 – Aug 11 | Jul 29 | 50–65 | semi-hardy |
| Kale | Jul 25 – Aug 11 | — | 50–65 | hardy |
| Swiss Chard | Jul 25 – Aug 11 | — | 50–60 | semi-hardy |
| Zucchini / Summer Squash | Jul 25 – Aug 2 | — | 45–60 | tender |
| Basil | Jul 30 – Aug 17 | Aug 13–17 | 30–60 | very tender |
| Kohlrabi | Jul 30 – Aug 16 | Aug 13–16 | 45–60 | hardy |
| Cilantro | Aug 4 – Aug 16 | Aug 13–16 | 45–70 | semi-hardy |
| Lettuce (leaf) | Aug 4 – Aug 21 | Aug 13–18 | 40–55 | semi-hardy |
| Turnip | Aug 4 – Aug 21 | Aug 4 | 40–60 | hardy |
| Spinach | Aug 9 – Aug 26 | Aug 13–18 | 35–50 | hardy |
| Dill | Aug 14 – Aug 21 | Aug 14–18 | 40–60 | semi-hardy |
| Radish | Aug 14 – Sep 8 | Aug 29–Sep 3 | 22–35 | hardy |
| Garlic | Sep 28 – Nov 18 | Sep 28–Oct 2, Oct 27 | 240–300 | hardy |
| Shallot | Oct 12 – Nov 12 | Oct 27–31 | 90–120 | hardy |
D’où viennent ces chiffres
Les dates de gel de cette page sont des normales observées en station, pas des estimations : elles viennent de Dayton Intl Ap (GHCN USW00093815), l’une des 6 808 stations américaines des Climate Normals 1991–2020 de la NOAA. La zone de rusticité vient de l’USDA Plant Hardiness Zone Map 2023. Le calendrier des cultures est exprimé en décalages par rapport à vos gelées, d’après les guides de semis des Extensions universitaires.
Quelle est la précision de tout cela ?
Extension recommendations for the same crop routinely disagree by two to four weeks, and occasionally more, so these offsets should be presented as windows and starting points rather than deadlines. Three things drive the spread. (1) Regional risk tolerance: for warm-season crops, Colorado State and Utah State put tomatoes, peppers and melons out about 14 days after the last frost, while University of Missouri's calendar works out to roughly 25-35 days after the last frost and University of Maryland's window runs from the frost date itself out to 45 days past it. That is a real 6-week spread for the single most popular garden crop, and it exists because a short-season mountain state is optimizing against a short season while a humid continental state is optimizing against cold, wet spring soil. (2) Soil temperature versus calendar date: most Extension services now say the honest trigger is soil temperature at 4 inches, not the frost date, and the frost-relative number is a convenience translation. A cold, wet spring can push the real date two or three weeks past the calendar recommendation. (3) Days-to-maturity is variety-specific and is measured differently for direct-seeded versus transplanted crops - seed catalogs count from transplant date for tomatoes, peppers, eggplant and cole crops, but from sowing for roots and greens - so a 'days to maturity' range of 60-85 for tomato is genuinely 60-85 depending on which packet you bought. Additionally, the average last frost is a 50% probability, meaning half of all years have a frost after that date; Extension services commonly advise waiting 1-2 weeks past it for anything frost-tender, or being prepared to cover. Treat every number here as plus or minus about 10-14 days.
Sur la station elle-même : une station météo, c’est un point. Les villes gardent leur chaleur, les vallées accumulent l’air froid, et un jardin en versant nord peut avoir deux semaines de retard sur un autre à un mile de là. Prenez cette page comme point de départ et laissez votre jardin la corriger — c’est exactement à cela que sert le journal de l’application.
Lieux proches
Rappels de semis pour Dayton
Un mot bref à chaque nouvelle et pleine lune sur ce qui est dans sa fenêtre en ce moment à Dayton — calculé d’après les dates de gel de cette page. Gratuit, un clic pour arrêter.
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